I'm super happy with my giant 29er. I would have (and still would) prefer something a bit more bling-blang, but for $1750 (minus cranks, front shifter, fd, bar, saddle) I couldn't say no. Especially considering that a niner frame alone is $1k+
Wheels are meh, and pretty heavy (2kg+) but plenty stiff. I've dropped 350-400g out of the controls and by going 1x9. Chucking on a set of 1600g race-ish wheels will get it to about 10.6kg. Not bad for a bike that owes me less than $2.5k.
I have a ti roadie, and while I love it, wouldn't race it. Ti can still be broken in a crash pretty easily, and repair, while possible, is not really feasible. I stick by the theory of racing on only what you can afford to, and are prepared to replace. If I wrapped my giant around a tree and killed it, I wouldn't be happy, but I wouldn't want to kill myself, which is pretty much how i'd be if I destroyed a $2,3,4K custom Ti frame.
Think about the gary fisher single speed. Run it SS when you want it, and if you must have 10v (1 or 3x10) you can do that too without having to tear down and replace a whole lot of running gear. About $2k even for that one.