I'll be using the Antec 300. Again, I'd like to go with something with more space (I really have my eye on the HAF 922) but the 300 is within my budget.
Baha,
That Antec 300 is a very nice mid tower case. I wish some of the more modern mid tower cases were on sale for you now! Every now and then you can find incredible deals on the cases [I was able to purchase Cool Master's Sniper cases last year for around $45 each and this year Fry's had the HAF 932 for $25 after rebate]. These types of deals are rare. Perhaps you could build with the Antec 300 and then when a super deal comes around, upgrade to an even nicer case!
A couple of things about the Antec 300:
1. It does fit Cool Master's Hyper 212 plus
2. Has a limit of 11 inches for length of your GPU
3. More fans can be added if you need them
4. Absolutely stellar reviews!
5. Many, many system builders have used the Antec 300 over the last few years and love em'.
I hope you can find a good deal on the Antec 300 Baha! It is a great mid tower case.
Enjoy!
Soar