I have a Premier II - which I bought very slightly used. The pistol hasn't jammed in several thousand rounds, is very accurate, and has a good trigger and good sights. What more can one ask for?
Personally, if you're looking for a shooter, you ought to be able to get something really nice, semi-custom, for about $1500, give or take a bit.
For some of the other pistols mentioned, My impressions are:
Ed Brown Kobra: Very nice. But you pay about $500 just for the Ed Brown name. A quibble - one Kobra I handled needed a little mild dehorning on the right side about where the trigger guard met the frame, just in front of the mag release. I think if I fired several boxes through it, it would rub my middle finger raw.
Wilson: Generally well made, but the ones I've handled had too many sharp edges all over. Normally you won't notice, but this is a problem if you're shooting in, say, a class and burn up 1000+ rounds in a weekend. I've seen more than one Wilson shooter with tape on his thumb or the web of his hand by the 2nd day of a class! Note that Wilson has some "upscale" models with $100 more in features which he sells for >$500 extra. (Price Rule: If it says "Tactical" or "CQB" it carries a premium price.)
Les Baer TR Special: Nice gun, but you pay about $100 extra for the TR logo.
STI: heard good and bad, no 1st-hand experience.
Colt: Very spotty quality. Some are reputedly nice, but I've seen - and had! - some real dogs. (And their warranty "service" is terrible.)
Valtro: Can't say, no 1st hand experience.