I don't have a favourite polygon die, unless the d100 counts, because it helps calculating statistics. I also like rolling multiple dice, because of the bell curve (hence trying out GURPS)
Welcome to the fray, DoomSparrow!
GURPS is an amazing toolkit and it is *very* easy to hurt yourself trying to use every tool in the box too quickly.
There is a fantastic GURPS "lite" 32 page PDF available on the SJ site - master that and you should be more than good to go adding in as much as you want beyond it.
GURPS is "simple but with as much complexity as you want" which can take some adjusting.
I am not a huge fan of "roll under" systems like GURPS - but not enough against them to not play or run.
"Bell curve" dice probabilities are nice for many things which does help... plus my favorite game of all time is also 3d6 roll under so there is that.
There is also a great book called GURPS For Dummies which I got and read through (I ain't too proud to say I am a dummy) that had a lot of good advice and points to ponder from long-time hardcore GURPS GMs.
I consider it mandatory for me to re-read the GURPS lite (and give it to players) and the GURPS for Dummies before running or playing GURPS these days myself - even if my next GURPS game is likely to be a solo game to run through some of the weirder settings books I have but never got to play at a table...
Finally, nothing wrong with percentile dice as a favorite - might be a good excuse to try a percentile based system like Basic Roleplaying, Rolemaster (you're welcome Kyle), Star Frontiers, Eclipse Phase etc.
And if you like rolling lots of dice ... you need to get a dice-pool based game going. If you have a few hundred d6's around, maybe Shadowrun or a Year Zero Engine game like ALIEN, Mutant: Year Zero, etc.