Here is a collection of items I found that can mimic Samus's Power Suit.
Spells, Powers, & Class Abilities are unlisted, sticking to items.
Suits
Power Suit: +5 Full Plate, 26,650gp.
With Varia Upgrade: Adamantine (+14,850gp) & Protection from Fire (+18,000gp), gain DR 3/- & Fire Resist 10.
With Gravity Upgrade: Plate Armor of the Deep (+14,000), gain waterbreathing, immunity to water pressure and no penalties to swim (FoM is overkill).
Phazon: ? HealthSS, +11,250gp, immunity to disease. ?
Dark: ?
Light: Planar TolerancePH, +25,000gp.
PED: ?
Zero: Run around semi naked.
Fusion: As whatever armor, but cloth instead of full plate.
Arm Cannon (using a longbow)
Power: +X Longbow.
Long: Long RangeD358, +100gp, adds +20ft to range.
Charge: ?
Ice: Frost, +1, +1d6 cold damage.
Wave: Shocking, +1, +1d6 electricity damage.
Spazer: SplittingCoR, +3, each attack splits into two separate shots.
Plasma: Exit WoundCW, +2, +1d6 damage and can hit everything in a line but a cumulative +4 bonus to AC applies (or flaming).
Others: To many to care or afford, get creative with enchanted arrows.
Grapple: Rod of RopesCS, 4,000gp, shoot retractable grapple hooks.
Missiles
Missile: +1 Seeking Explosive Arrows, 8,301gp for 50, add a 1d6 fire damage 10ft burst effect and ignores concealment/cover.
Super: +1 Starburst Seeking Flaming Arrows, dunno, arrows become 20ft burst effects, to a fine creature a medium weapon is a siege weapon...
Seeker: Splitting, see above, doesn't stack.
Ice: +1 StunningHoB BluntMotW Arrows, 8,301gp, stun dc 13 fort negs.
Morph Ball
Ball Mode: ?
Boost: Land speed enhancements.
Spring: Most forms kinda have the option to jump...
Spider: Slippers of Spider Climbing, 4,800gp, stick to walls Metroid II style.
Bombs: ?
Power Bomb: ?
Movement
Speed Booster: Boots of Striding and Springing, 5,500gp, +10 to land speed & Crystal Of Alacrity, 3,500gp, +5 moral to speed.
High Jump: Boots of Striding and Springing, 5,500gp, +5 competence & +4 speed to jump checks.
Space Jump: Phoenix CloakMiC, 50,000gp, gain (land speed)ft. flight with perfect maneuverability.
Screw Attack: +1 Valorous Armor Spikes, +4,350gp, 1d6+1+(str) x 2 damage on a charge.
Sense Move: Armor of Mobility, +15,000gp?, gain Mobility (+4 vs AoOs from moving).
Sight
X-Ray: Ring of X-Ray Vision, 25,000gp, X-ray sight.
Thermal: ?
Echo: Blindfold of True DarknessMiC, 9,000gp, 30ft. blindsight (not that you could see a damn thing).
Dark: Nothing.
Other
Suit Activation: Ring of ArmingMiC, 5,000gp, calls your arm and weapons.
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