Instead of the Corsair liquid cooler, get the Cooler Master Hyper 212 EVO. Performance is similar for only 35 dollars. I would encourage you to stick with the HAF 912. That way, you have more to spend in terms of GPU. The Radeon 7850/7870 will be the best choices at the moment. You can also wait for the mid-range 6xx series. It may be worth the money.
The system you've put together, especially if you throw in a 7850 or 7870 is going to rock, IMO.
I just built a new system that's really close to what you have lined up. I'm only running a 6950 and it's performing way beyond my expectations. Max settings on BF3, running smooth as silk. I think you'll be quite pleased.
You mentioned you already have a Hard Drive. If it's not an SSD I'd highly recommend you get one. After dropping in an SSD the preformance increase has been quite noticable.
The reason why i wanted the H80 because i want to overclock the I5 2500k to 4.3.
To add a personal anectdote to what Metal Orient said:
I've OC'd my i5 3570k to 4.4 and I'm cooling it with an H60 no problem. From what I understand the 2500k doesn't run as hot as the 3570k so you probably don't need to drop that much money to keep it cool.