It is a good thing you slipped back to the GTX 260, the OCZ game extreme only has two 6 pin PCI express power connectors, and not the 6+2 connectore the 4890 requires. Though it is a very decent PSU, it’s connectors just aren’t there. The game extreme has 80+ efficiency (Though they don’t advertise it for some reason ), good ripple and, reliability. I am very happy with that PSU.
You can shave 10 buck off by getting the Gigabyte EP45-UD3P. Basically the same thing.
I still say avoid Hitachi drives. The WD 750 black is the same price. Sure you lose about 250GB, but you gain reliability and performance. Don’t worry about buying cables. Your mobo will come with at least two sata cables.
I’m not a big fan of the panels used in Acer monitors. Quality of colour etc is about the same as any TN panel out there, but the input lag is really annoying. I think the ASUS VW246H 24" is the same price, and the input lag doesn’t seem as much a problem.
Don’t let physx sway you decision making. It looks like it may be something a few new games have, but AMD cards have a similar variant they showcased that could be more widespread because of it’s open code. It’s too early to tell, and it won’t matter much in the future. That being said at the resolution you are playing at, it’s not going to matter. GTX 260 is going to own all.
I would consider Intels dual core offerings. You are paying for two extra cores you may not use in but a few applications. Higher clocks are going to matter more to you most likely.