ok so I am in need of some advice. I am 6' 2" and 250lbs so a good ole clyde. I ride a pedicab (cycle cab) for a living and have legs that break lots of bike parts. how im still a clyde i dont know heh... Anyway I recently converted to riding fixed and am so glad I did. I started with a converted 87' Univega and then got a good deal on a Fuji elios 2 track frame (the 2007 I think). So far so good but I dont feel comfortable standing and sprinting/climbing hills on it. I'm looking to get something that is stronger. I also plan on riding track this summer pretty often and this will also be my everyday bike too. So I'm looking for something that can do a bit of both as I ride my bike 20-50miles a day.

What I have been able to find online for frames have been mostly the 700cmx stuff as far as burly goes. Those include milwaukee, and volume at least as far as price goes (under $700, though under $500 would be better). Then there are frames like the Bare Knuckle. I also hear IRO and I Kilo TTs talked about here a decent amount.

Then another matter came up that shot me in another direction frame wise. I have always been against aluminum feeling that I would break it pretty easy. But then I read about clydes on aluminum and that if you are a clyde aluminum is good for stiffness as like me we flex steel pretty easily (I can flex the lower triangle almost a centimeter). This got me looking at the Leader V2 721TR Track Frame its aluminum and the price is nice too. or should I be looking more at the V2 725TR 2010 Track Frame or Leader 735TR Track Frame? And are Keirin frames tough I thought they needed to be so was wondering about the whole 2nd hand market.

Also is it ok for a clyde like me (I ride hard and agressive) to use a carbon fork, has the tech come that far?

So please any advice on frame choices would be so appreciated! Or at least some good pointers from other clydes or people who know about our needs.