While Duskblades aren't natural qualifiers, their Arcane Strike ability works wonderfully with Swiftblade.
I did not use Drake Helm, Knowstones, or other cheesy ways to get spells on your spell list. They might be subpar to your usual builds, but I tried one and found it quite fun.
Note: By RAW, you can't use spring attack with channeling, but if your DM let's you do it, this build becomes awesome
Duskblade 3/Wizard 4/Abjurant Champion 1/Swiftblade 10/Abjurant Champion 2
Snow Elf(+2 Dex, -2 Cha) or Fire Elf(+2 Dex, +2 Int, -2 Con, -2 Cha)
Base abilities(32pts):
Str 14
Dex 14 (you can swap this with int if you want)
Con 14
Int 16
Wis 10
Cha 10
Feats
1 Power Attack
B Combat Casting
3 Knowledge Devotion
B Expeditious Dodge
6 Mobility
9 Elven Spell Lore/Spell Mastery(if you intend to take Signature Spell)
B Spring Attack
12 Arcane Strike
15 Practised Spellcaster/Signature Spell[Haste]Forgotten Realms
B Bounding Assault
18 Flyby Attack/Versatile Spellcaster
Alternative Class Features
-Generalist Wizard: Can't specialize, 1 more spell/day of highest level. At 3rd level, double your familiar's bonus.(giving +8 initiative with your Hummingbird familiar)
-Combat Wizard: Trade Scribe Scroll for a Fighter Feat
Notable Features, etc
-18 BAB
-Casts as a level 13 Wizard(gets access to 7th level spells)
-Arcane Channeling
-+2 Attack, Dodge AC and Reflex Saves
-+20ft movement
-+1d6 damage if you move 10-20ft in a round, +2d6 if you move 20ft or more
-Individually targeted spells, Melee and Ranged attacks have a 50% miss chance against you. All the time. Yes even in an Antimagic Field
-Cast haste as a free action.
-+int to initiative
-2 standard action per round.
-Time Stop as a 6th or 7th level slot
Variant 1: Human
[spoiler]
Duskblade 3/Necromancer 4/Abjurant Champion 1/Swiftblade 10/Abjurant Champion 2
(Necromancer for more castings of Vampiric Touch, Night's Caress and Bestow Curse, although I guess Transmuter could work too)
Forbidden schools: Illusion and Enchantment
Human
Feats
H Expeditious Dodge
1 Power Attack
B Combat Casting
3 Knowledge Devotion
B Mobility
6 Practised Spellcaster/Spell Mastery(if you intend to take Signature Spell)
9 Elven Spell Lore
B Spring Attack
12 Arcane Strike
15 Versatile Spellcaster/Signature Spell[Haste]
B Bounding Assault
18 Flyby Attack/Practiced Spellcaster
Alternative Class Features
-Combat Wizard: Trade Scribe Scroll for a Fighter Feat
-Trade familiar for Abrupt Jump
What's different?
More Necromancy Spells/day
Bonus Feat
Bonus Skills
No stat bonus
No familiar bonus[/spoiler]
Variant 2: Kobold Sorcerer
[spoiler]
Duskblade 3/Sorcerer 4/Abjurant Champion 1/Swiftblade 10/Abjurant Champion 2
Dragonwrought Arctic Kobold(+2 Dex, -2 Str, -2 Con, -2 Wis) (Dragonwrought is taken for +3 Int/Wis/Cha(hence the odd scores) that come from being Venerable)
Base abilities(32pts):
Str 16
Dex 14
Con 14
Int 9
Wis 9
Cha 15
Feats
1 Dragonwrought
B Combat Casting
3 Expeditious Dodge
6 Mobility
9 Draconic Reservoir
B Spring Attack
12 Arcane Strike/Knowledge Devotion
15 Versatile Spellcaster
B Bounding Assault
18 Flyby Attack/Practised Spellcaster
You have to do the Greater Draconic Rite of Passage, which effectively gives you +1 sorcerer level for free(no LA or anything)
What's different?
Way more Spells/day
Spontaneous casting
Better mental stats
Less Spells known
Loss of 3 feats(1st level for Dragonwrought, no bonus Wizard feat, have to take Draconic Reservoir)
Casting based on Charisma[/spoiler]
Variant 3: Cleric
[spoiler]
Duskblade 3/Cleric 5/Swiftblade 10/Cleric 2
Domains: Time(needed for Haste) and another one(Destruction, Envy, Liberation and Spell are good domains)
Human
Base abilities(32pts):
Str 14
Dex 14
Con 14
Int 12
Wis 16
Cha 8
Feats
H Expeditious Dodge
1 Power Attack
B Combat Casting
3 Free(aka there are many good feats for clerics, choose one)
B Knowledge Devotion
B Improved Initiative
6 Mobility
9 Practised Spellcaster
B Spring Attack
12 Arcane Strike
15 Versatile Spellcaster
B Bounding Assault
18 Flyby Attack/Free
Alternative Class Features
-Cloistered Cleric, Trade Knowledge domain for Knowledge Devotion. Make up for bad BAB with Divine Power
-Spontaneous Domain Casting (Cast Domain spells spontaneously instead of Inflict/Cure Spells)
What's different?
Bonus Feats(+1 Human, -1 no combat wizard, +1 Knowledge Domain->Knowledge Devotion, Improved Initiative for free)
Bonus Skills
Domain Power
Different(Better, IMO) Spell list
No stat bonus and more MAD because of wisdom
No familiar/familiar bonus
[/spoiler]