I'm looking into buying a cross/cyclocross bike and would appreciate some expert advice from the experts like yourselves (thanks VERY much in advace). Here's some background, what I'm looking for and what I'm concerned about:

A -- I'm about 6'5" tall and weigh about 220-225 lbs.

B -- I am not a racer but enjoy recreational/serious recreational riding (20-50 mile rides for fun, exercise and friends)

C -- I have a steel road bike (8 yr old custom Zinn w/ Durace) and am looking for something to use for unpaved trails (crushed limestone typically), the rougher streets/Chicago Lakefront paths and nastier weather. (Note -- I'm 50 and not planning to ride on terrain any worse than the above)

D -- I'm interested in the Specialized Tricross (alum frame version) but I'm concerned about the large aluminum frame handling this stress of weight over time.

I'm hoping to get some guidance on the following:

1 -- Is the Specialized Tricross a good choice -- any other specific make/models you'd recommend. Unfortunately, the reality of the current economy makes the possibility of another expensive bike impossible so economics are part of the decision equation).

2 -- will an Aluminum frame work for my size and weight?

Thanks !!