I paid £4200 for my 03 Warrior 2 years ago with 67000 full Mitsi history, canopy and pretty tidy condition, its only got 78000 on it at the moment and its got all the bells and whistles and its still tidy, id reckon its worth about 3300, unfortunately the peak price season for 4x4's is generally late autum / winter we're now into spring-ish, so prices aren't as strong.
I think of you put 4k on it you'll scare folk away, spending money on cars doesn't equate to getting it back at sale time I'm afraid.
You still see crack smokers on ebay and used car dealers wanting 5k for 2003 trucks but their kidding themselves on and are just after folk with no money wanting them on the drip.
Personally I'd put it on about £3500 and anything over £3000 is a bonus, but you may be lucky, it all depends how quickly you want it sold.