i like my temjin, but it is prolly more than you want to spend. make sure when you get the ram that you get at least pc3200. that way you can run 1:1. you could even try pc3500 if it's not too much, that way you would have plenty of room to oc it all if you would like to. you would still get a decent oc out of pc3200 though.
as far as the case, you opinion. i like to stick with better names liek silverstone and antec, but anything really will do. as long as you like it and it has what you want. i really like the new thermaltake armor, but again, prolly more than you wanna pay. try places like xoxide.com and performance-pcs.com. they have some good ones.