So... based off the suggestions I've got in the thread I've made a tentative build...
Race: Whisper Gnome
Psychic Warrior 1 / Targetter Fighter 1 / PW +1 / TF +3 / Peerless Archer 3 / Deepwood Sniper 7 / +4 levels free
Feats:
Flaw (Vulnerable): Point Blank Shot
Flaw (Noncombatant): Far Shot
1: Darkstalker
PW 1: Psionic Shot
TF 1: Exotic Weapon Proficiency (Greatbow), EWP (whatever), Vital Aim
3: Psionic Meditation
PW 2: Weapon Focus (Greatbow)
TF 2: Quick Draw
6: Fell Shot
TF 4: Precise Shot
9: Woodland Archer
12: Weapon Specialization
15: Ranged Weapon Mastery
18: empty
Psychic Warrior's Powers: Chamaleon, any
Now... I'm somewhat satisfied with the build, even if I feel it lacks utility out of stealthy/combat situation so anything improving that would be nice (I was thinking of going PsyWar 4/Targetter 2 and dropping Weap Spec and Ranged Weapon Mastery for example but I'm not sure). Still any suggestions are welcome.
Adding some meat on the stew, let's talk items!
A custom-made something-of-hunter's mercy is a given, so is a dex bonus item, but what about all the other slots? I'm not necessarily looking for anything that makes him do more damage, just for stuff that would make him more fun to play and maybe a bit more stealthy too.
On the damage side there's the bow tho... Splitting is out since it breaks the idea of ONE arrow... Force is nice, and what else? Prismatic Burst? are the other bursts worth it in you guys' opinion?