the reason everyone is saying stay away from europe ROM's is they all use gsm tech. sprint and verizon use cdma. they don't get along and that is one of the only ways to really "brick" your phone.
seriously though, there are roms in 6.5 for sprint.
check this one out, very easy to do and it works great.
http://forum.ppcgeeks.com/showthread.php?t=102276
if you decide to do it, let me know and i can send you the sprint dedicated cabs. (they are around here too)
i'm using the 6.5.3 titanium only version and added mobile shell.