I'd go for 45s Nick, D'Addario or Elites are usually good. I'd avoid flatwounds as they sound a bit dead, but halfrounds (sometime called groundwounds) are a good compromise. Of course get flatwounds if you're worried about your girly fingers.

But if you are interested in something different, check out Thomastik-Infeld strings. I've got the acoustic version on my Ovation bass and they are incredible. Check out the reviews at BGRA.net.

All the best!
Les