Really depends what type of PvP you're going for: Solo/Teamed, Arena/Zone. And flight is largely considered pants as a PvP travel power, SJ/SS for "mobility" and Teleport for escaping are your options.
Acrobatics, SJ, SS, at least one layer of +Perception. A self-heal. ST ranged damage that's not smashing or lethal. A -jump power or at least a means to slow your foe's movement. Resistance rather than Defense shields. Major debuffs or buffs, +tohit/+damage/+resistance buffs and -defence/-resistance debuffs are probably best versus heroes (they've a lot more tohit buffs and defence buffs than you)... as well as anything that's unresisted or autohit like /Cold's Snow Storm or /Traps' Poison Trap.
Ice/Cold Corrs are something of a FOTM build due to all the slows they can dish out. Like most things in PvP there's a "Paper" to its "Rock" though (Ice Tankers). Thermals with Heat Exhaustion + Melt Armor are quite powerful too. Aside from /Traps (MM's are better), /Cold and /Thermal, Corr secondaries are the same as Defender Primaries... meaning that Defenders generally get better buff/debuff numbers than Corruptors.
There are NO ultimate builds when you can have Thermal and kinetics in team, instead of thermal only or kinetics only. When i saw this thread name i thought exactly Mael's first lines. Depends what type. Mael pretty much said sum it up for me. So it pretty much depends what you wanna do. I wouldnt make a zonal corruptor for solo. Either teams or solo/team arena. In this case it depends again on what you wanna do in teams or arena.
I was thinking primarily for soloing PvP in the zones rather than Arena.
Union: @Ban-Sidhe
I hear AR/Traps rocks
o arn't u a funny guy..
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I was thinking primarily for soloing PvP in the zones rather than Arena.
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Ice Fire or Sonic Primary, and /therm /rad or /cold are probably the best for solo PvP in zones.
Edit: Probably least favoring Sonic Blast, as it takes time to stack the -res etc, so usually someone else kills your target before you do! 
Either Ice or Fire are great for zonal.
My favourite is Fire/Rad
Self heal
Major debuffs
Good attacks + D.o.t
all good 
Although most builds can work really well in pvp some just better than others.
<3 Ice/Kin
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
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<3 Total Inertia (Ice/Kin)
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<3 Total Inertia (Ice/Kin)
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Does anyone have any suggestions? I'm assuming that having Flight and ariel superiority decked out to the max is probably good. Along with having the relevant recipes to max out your damage. But what would make the ultimate PvP corruptor?
Union: @Ban-Sidhe