What base coat and top coat do you use?
It depends, I've got base coats ranging from A-England The Knight, to Sally Hansen Tough as Nails, to OPI Ridge Filler. Right now I'm using Tough as Nails because my nails are super weak at the moment.

For top coats I tend to use Revlon Quick Dry since I ran out of my Seche Vite, it's as good as Seche (in fact it tends to have less shrinkage) but it definitely isn't as shiny. Otherwise I use A-England The Shield, or Sally Hansen Hard as Wraps for glitter.

How many nail polishes do you own?
At the moment (17/09/2012) 141, with about 15 on the way haha!