For $150-ish, the IP35 PRO is a solid board. You might want to consider the X38/X48 if you're going to keep the board for years.
OEM software works on anything. It is just the packaging or the lack thereof that is different from retail. Oh and no hardcopy manual (these days what software gives you one?), no jewel cd/dvd case, etc. Just the cd, a license and an envelope/holder. OEM is supposed to be sold with a complete pc like DELL, COMPAQ, IBM, HP, etc.