That Arivee is a great deal! I'm 6'3"! How come I didn't find that deal!?
Well, the first thing to do is take the Arivee out for a long spin. The thing you want to check on a Ti bike is whether or not that frame is going to flex laterally under your load. Do some climbs and some sprints in different gears. If the frame flexes too much, you should consider passing on it. If you're happy with it you should buy it immediately.
I've ridden aluminum for a long time, it handles heavier riders better, but I've never been a big fan of how it rides on the road. You may be ok if you're doing 15 mi rides, but at 30 mi I definitely start to suffer from the road chatter.
I'd check out the 07 Sarthe at the same pricepoint. That's my favorite Lemond because it has a beautiful steel frame. I think that may be the way to go if the Arivee doesn't work out.
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