FreeNAS on poweredge2950

[Intruder11]

I have read some of the discussion on the 2950 I an kind of lost. I get I need to re,over the daughterboard and put a new controller board in. The last thread I read was about 2years old. What card should I buy. I will be starting with 4 2tb drives and want to put in 6tb or larger later. So what card should I use I have seen 3listed. Which one is the best and easiest to change the firmwear on. Where can I find the firmware and what do I flash it with???? Thank you in advance for the help