Dysons pretty awesome, I've had one for years without issue. I bought it, and I haven't spent a single dollar on it since then. Other bagless vacs have filters that either need to be replaced, or clog up horribly (LG in particular comes to mind).
The basic model (499? or whatever, haven't worked in new retail for a while) is the same machine as the more expensive one, but without the telescope wrap/turbine head etc. Just buy the cheaper barrel, and buy accessories seperately - the margin in dyson accessories isn't awesome but any salesman worth their salt will give you a decent price if you get accessories with it.. get the carpet turbine head, its about 80 bucks (the price diff between the one with and without is 100) and the car cleaning kit is very nice, about 100.
The only thing that sucks about dysons (perceived suckage) is the lack of power control, features, etc. All it does is provide endless suction... and it sounds pretty nice too.