CRAIGLUT where did you get the $50 pump how slow is it? I had one that would go in the lighter and it took it seemed like 30 mins for a car tire.
Not to worried as long as it can pump it up in 5-10 min's.
I got mine from Amazon, a lot of guys around here use them with good results. You can sometimes find it at Costco for $49. I have had mine mounted in the engine compartment just in front of the spare battery holder for about a year and it works great. I can air up all 4 tires from about 25 psi to full in about 10 minutes. I have never timed it filling up the spare.
http://www.amazon.com/Q-Industries-MV50-SuperFlow-Compressor/dp/B000BM8RT8/ref=pd_bbs_11?ie=UTF8&s=automotive&qid=1234182838&sr=8-11