Which A/C Compressor for 01 LeSabre?

2001 LeSabre w/ 190K miles, basic a/c system (not climate-control or dual-control). Looking online at new compressors ("remanufactured" ones are oftentimes a bad joke), I'm seeing the following ones available:

AC Delco 15-20453
AC Delco 15-21663
Delphi CS20009

Is there any difference between the above parts, and if so - what? Is one better than the other? The Delphi is usually more expensive, but carries the same warranty.

This is the one you should purchase: Click Here (http://www.rockauto.com/catalog/moreinfo.php?pk=366691)
Look at the cost: Click Here (http://www.rockauto.com/catalog/raframecatalog.php) and enter your vehicle info.
BTW, this is a new compressor and not re-manufactured POS! I installed one of these on my PA about 2-yrs ago and the performance is flawless. Be sure to replace the expansion valve and accumulator and flush system at the same time, otherwise warranty is void.

Your system uses an oriifce tube, not an expansion valve, so it will be much easier to find parts with this in mind. and cheaper.

Thanks for the info, I was thinking the Delphi one was the way to go. Most places price it significantly higher, except for Rock Auto and Amazon (whodathunk Amazon sells car parts???).

And no worries, I know it's a CCOT system and has no expansion valve (but I wish they'd go back to the old POA-valve-based systems, they were awfully hard to beat!)