Yep a bed is one thing not to cheap out on. It's a good idea to skip the box spring and get a high end mattress, I never understood the point of a stupid boxspring... a piece of plywood accomplishes the same thing. When shopping I hate how the companies make it so hard to compare or price match, every store has a different name for the same damn mattress.
A cheaper brand could have problems with the foam layer becoming lumpy/misshapen, not to mention squeaks, sagging, all manner of problems that can make a good nights sleep impossible. Test a few of the higher end name brand ones, even if the "no name" feels as good, it probley wont feel that way for long.
Epson EX71, Tosh HD-A2, Denon AVR590, Athena P4100, Infinity P362,C250,P162. RCA L42WD22, Pio VSX1016, Athena LS50