No need to change distro - remove what you don't want and install what you do want...
I started with Mandrake 9.x back in 02/03 and after years of on and off usage moved to Ubuntu in 2006. The dual booting continued - until about '08 when I discovered Debian. That was pretty much it for windows - haven't run it since.
Nowadays I dual boot Slackware 14.1 and FreeBSD 9.2 - can't really imagine switching from Slackware now. I tried to switch back to Debian about a year ago and stuck it out for about ~ 2 months and went back to Slack'. Best GNU/Linux distro by far, in my humble opinion. Debian is still my second choice by a mile however.
My favourite OS is easily FreeBSD however, quite a learning curve, but the old style UNIX simplicity and plain text config is very refreshing. It's also much faster on my old machine and extremely responsive.
On both systems I run just fluxbox - if you want to run games, just run a window manager - frees up resources.