WAHOOOOOOO !!!!! I think its happy hour!!!!!!!
Now if you want to stay using ROM Manager, it would be worth your while and a few bucks to get the paid version of RM in the market as well. If you do that and once you are all set up, please make a backup of your system. You can do that through RM (if you have both paid and free).
Also, real important. You cannot flash just any theme over sapphire. Once you have the paid version of RM, you can go into RM > download roms > look for bgill. There you will find compatible themes for sapphire. Also you can go into sapphire's thread here on the forums. YOu will find them in the Custom ROM section under cvpcs. there you can find other themes that you can download just as we have here and install using RM.
When you go into the dowloads section of the market, are all your previously downloaded apps downloading?