The thing with FR tremolos is that you gotta have some experience to make some changes to your guitar set up.

As you said you like to play heavy sounding stuff, so more likelly you don't tune standart, you may wanna tune low (drop d for example) so, you must wanna use some heavier string (heavier than let's say 9 gauge), so you may need to tighten your tremolo springs and action of them so on and on...

I't not really a big deal and FR it's a funny damn thing to have but I gotta say I just love the fixed bridge. You want a mean looking ars kicking guitar, get it with strings thru body (check in jackson the Christian Olden signature axe... it has the word BADASS written al over it), the are easier to set up, I have the idea that string last longer on them (or maybe I abuse a little too much on my whammy....mmm... haven't tought it that way..).

If you are into dive bombs, crazy pull offs and pirotechnics, well get it with FR, if you are more like a hard hitting pounding metal, string bender and stuff like that I recomend a lot the fixed bridge.

I have 3 guitars one with floyd and the other 2 (including a 7 string) with fixed bridge... my Dean with FR doesn't have so much action like the other 2 (I had to be hones bout that).