Hey Smiley!
Are you watching this thread?!?!

So,
Aluminum might be the way to go.
My take: Get a really good aluminum frame. Maybe a Stumpjumper

.
THen spend the money on great components like : WHEELS!
and brakes, bar, stem, seatpost, seat, pedals, cranks, BB, etc...
Aluminum is strong, stiff, (comes in larger sized tubings

), and available in many offerings.
They say a stiffer frame is preferred for heavier riders.
With the money you'll save on the frame, you can go hog wild with the components.
(
there's nothin like beautiful Ti though

)
JM2C