Dear Cap'n
I use the Millenium 3x100+1x84/12.4 frame and have nothing but good things to say about it. I've ordered their 4x100 and new boots to take it, just waiting on those to show up.
I think it's a certainty that bigger wheels = better conservation of momentum at higher speeds . That doesn't say that you'll be a faster skater of course, only that once you get going fast, it's a wee bit easier to keep going fast.
the longer frames (5x84) give an advantage in gearing, i.e. sprinting up to speed, but i'm pretty convinced that the shorter 100mm based frames are infinitely more manueverable, and i find less fatigue in my legs after longer periods of time on them. I'm looking at a set of 4x84 frames too, FWIW.
I'm planning on having options in all my events this year, and i'll take into account how much hill work, bad pavement, water and top-end hammering i expect to encounter in a give event before i decide which frames i'll wear. I should say i think i can manage that because i switch setups so often i can move fairly seamlessly from on to another.
on the wheels:
the Xenan wheels are awesome, too expensive and easily bent into a shape very unbecoming of a wheel.
the "revtek wheels"
revtek @ swat skates
are the lightest thing going, and except that they're a pukey yellow color, have gottent the best reviews i've heard. That said, i train on labeda scoooter wheels (it's all about the profile) and race on the xenan's, for now.
peace,
jenni