I compare things for a really long time before I end up pulling the trigger.

I think the only bag I ever purchased on impulse was a Chrome Metro, but that was because of the 50% of sale they had, and I had wanted one for a while.

Just sit there and compare until you are absolutely sure that is what you want.

EDIT: ****, there's that one guy on here who purchased a PAC bag (I think it was) for 400$, like 5 years ago. IIRC, his bag is still going strong, holding up to every day abuse.