I wonder the same thing sometimes to be honest with mine. Have a look on AutoTrader to see whats out there.
WKs are very well priced, although most are diesels here which I wouldn't want. The odd HEMI pops up as does the SRT (insurance would hurt on that tho).
Problem is the condition. My WJ is 'mint' and I mean that. My boss at work bought a three year old car and it has several scratches, a ding (which the dealer fixed) and bumper rash up front. He didn't pick up on the scratches but things like that would annoy me and I'd need to pay to get it resprayed/fixed.
If my Jeep had been in an accident and was round 140k I would be considering moving though, so I'd say go for it!
I'm maybe just loopy, spent £3.5k on my Jeep this year. Double that and I could be in an '06 Limited HEMI or a little more Overland. But still, I just love the thing!