That first build, I'd rather have a point in Imp Life Tap then Suppression. I levelled without suppresion, and put 1 point in it at 70. Never really had a problem with resists.
I'd also not take Imp CoA. Imp CoA adds 5% to your CoA BEFORE modifiers and +Spell Dam. IF it runs it's full course. If no then it adds even less, as it does not add an equal amount to each tick because of the way it's damage is backloaded. Imp CoA is one of the most worthless talents in the Affliction tree.
This is better:
http://www.wowhead.com/?talent=IVMRco
As for your second build, 30 is a little early to have Empowered Corruption at max. You really don't start getting enough +Spell Dam to make it that worthwhile until closer to 40. I'd rather have nightfall and grim reach at max. with 2 points in Nightfall I notice it proc nearly every fight, at worst every other fight. Range is one of our best weapons, why not increase that range.
This is how I was at 30:
http://www.wowhead.com/?talent=IVMRVRbz
The only thing is, if your not a Drain Tanker, you could probably lose the points in Fel Concentration, though they are very useful for when you do pull aggro, or in PvP situations where you can't avoid being hit.