You're right, I got excited. Many of those games won't hit till Q4, but I don't think the Xbox will drop to $99 anytime soon (a year?, year and half?), so I'll revise my previous post:
I think $149 is a good buy point for the Xbox. There are some nice exclusives that I feel make it worth owning:
Right now, you can play KOTOR, Project Gotham Racing 2, Rainbow Six 3, Ninja Gaiden, Crimson Skies, Deus Ex 2, Elder Scroll 3, Otogi, Panzer Dragoon, Colin Mcrae Rally 04, Top Spin, Moto GP 2 and, of course, Halo...to name a few.
Next week, you can play Splinter Cell: Pandora Tomorrow.
In two to three months, you can play (according to ebgames release info):
rallisport challenge 2 5/4
thief 3 5/17
dead or alive 6/1
sudeki 6/1
full spectrum warrior 6/8
fable 6/15
And then you can wait for Christmas (hopefully) and pick up a few of these:
BC
Chronicles of Riddick
Doom III
Half Life 2
Halo 2
Jade Empire
Otogi 2
Star Wars: Republic Commando
True Fantasy Live Online