For wheelin and around town, the four cylinder is fine. It's just not good for highway driving of any distance.
Have you hugged your Jeep today?
P.S. Why don't ya join us in gill's for some chatting sometime? http://itsajeep.org
Labor from an independent a/c specialist was about $300 (he gave me a discount for paying in cash). So altogether it was about $1000.