I know alot of people prefer Convection ovens, I myself have one and LOVE it to pieces, if you can aford to get it, the convection oven is the best!
Next would be a toaster oven, but that has alot of problems especially burning and browning where you don't want it because the clay is very close to the filiments!
Have you worked with PREMO clay at all??? You can always paint the colored clays, but it's so much fun to work with the colors and the Premo clay has a much stronger consistancy.
I know there are many many clayers that would love to give you a bunch of answers, but they are in Polymer Clay Central, I do hope you will come over and ask that question again in the PCC forum, you can get there from the menu above, it says Polly's FriendLEIGH forums!
Hope this helps!