After experimenting with a lot of different ones, here's what I always go with:
3) APT backup
8) Per Page HTML
With those apps, I can pretty much do anything and use any theme out there. Oh, I also use PDA Net creating a hotspot (free) which works awesome. I'm not a fan of redundant Twitter apps or SMS apps, to me they just clog up my memory. I like functional apps that make using my phone easier, quicker and look good.