ive owned all 5 that you have listed at 1 point.....all are great guns, but heres my opinioin....
wilson combat- excellant guns, ive owned 3, still have 2, both are a dream to shoot, excellant fit and finish, customer service is phenominal, none is better, the best of the best from my experience
christensen arms- these are really nice, actually my second favorite. i have the officers model and it shoots like a dream as my wilson sentinell does. the fitting on these is great, i dont see them around to much, but they are very nice guns.....you should be able to get a wilson for the same price if not cheaper.....
ed brown- nothing bad about these, ive had no issues, for the money to me its not as good as a wilson combat.......wilson hands down
les baer- read a lot of ranting andraving on these, to me not worth it, ive handles a few and owned 2, sold them all. they are way to tight fitted, the finish looks par at best to me, i was not hapy with these and wouldnt buy another. not worth the money
nighthawk custom- had a couple of these as well, no real issues functioning wise, the finish did not hold up on any nighthawk i have had, and had a issue with 1 of them ( trigger bar/barrel lugs not fitted) and customer service was a joke. took over a week to get a call back, and i had to pay return shipping....on a $3000+ gun..your crazy......so after that sold them all.....i know all mfgr's have issues at some point, but the cust service killed it
*****wilon combat all the way......christensen arms 2nd.....
****** have a few STI"s, and i am very happy with them, i will reccomend STI's all day.....if you cant/dont want to spend the $$$ on a wilson, STI has some very very nice options.....