I have a Craftsman 15 gallon compressor.
What you really care about is how many CFM it can do at 90psi...
<table> <tbody><tr><td>
SCFM Delivery At 40 psi
</td> <td>
4.9 SCFM
</td> </tr> <tr><td>
SCFM Delivery At 90 psi
</td> <td>
3.5 SCFM
</td></tr></tbody> </table>
"Craftsman 15 gal. Air Compressor, 3 hp. Vertical Tank
Sears item #00916644000 Mfr. model #16644
Vertical portable compressor with a 3 hp umc motor for greater starting torque and improved operation in low-voltage conditions. 150 psi maximum working pressure. Operates many DIY air tools. 2-in. gauges. No assembly required. Includes a 3/8 in. ratchet and 20 pc. assembly kit."
http://www.sears.com/sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=TOOL&fromAuto=YES&bidsite=CRAFT&pid=00916644000
I'm happy with mine overall. I THINK I paid about $180 for it (it was on sale for $200, and I got 10% off for getting a Sears card), so it was money well spent. I only have two problems with it.
1-It's damn loud. Make sure you buy those ear-muff things to attenuate the noise, or you'll have a headache in short time.
2-Since it's only 15 gallons, the motor will be running more than it won't be when it's under heavy use, so it makes issue #1 even worse.
However, it's a good balance between cost, performance, and size.
If you want to make good use of an air compressor, get something at least comparable to this.
Also, it comes with a small set of air tools, including some plastic hose. The plastic hose can tend to kink, so you may want to eventually replace it with a $20 rubber hose someday.
If you plan on doing major work on your car (engine, trans, suspension), spend another $100 when you can and get a good impact gun. Mine is my favorite damn tool ever.
Edit: Here's my impact gun...
http://www.partsamerica.com/ProductDetail.aspx?categorycode=3369&mfrcode=APO&mfrpartnumber=AR3651