Having used both RedHat 6.2 and 7, I would say that 7 is quite a bit better. It has more support out of the box than did 6.2
If you aren't stuck on RedHat, then Mandrake Linux 7.2 (Based on the RedHat 7.0 distro with pentium base optimizations, if you didn't know) has a bit better support if you ask me.