Gretsch - I used to own a 1964 Nashville, which was a great guitar, and the neck profile was very slim, but it wasn't as good as the Gibson's from the same period in terms of sound quality and overall 'vibe' (IMNSHO

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The quality control seemed to be less stringent at Gretsch during the same period.
Having said that, there are undoubtably great Gretsch's out there - it's just more difficult to find them.
(Usual disclaimer here - your experience may be different)
The new re-issues that I've played have generally been good instruments, but I would try and find a used one that has been played a lot.
It's been my experience that there's a reason some guitars get played a lot - and that's because they were owned by pros - and pros won't put up with a poor sounding/playing instrument - so a guitar which has been played a lot (but not abused) is probably going to be muy cool.
Don't be afraid to buy a used guitar from a reputable dealer - if you don't have the knowledge to buy used with confidence from your local 'Nifty Nickel' go to a reputable dealer and buy a high-quality instrument.
There's not too much that you can do to screw up a guitar that someone who knows what they're looking at won't spot, and the reason you spend a little more at a good dealer is to pay him for that knowledge.
Ask 'Has this guitar had any repairs or changed parts?' and if so what are they and who did them.
If they were done by a pro, and the parts that were changed were good (e.g. replacing tuners with Shallers or Gotohs, pickups with Seymour Duncans or Lindy Fralins, etc) those changes and repairs will be reflected in the asking price (and also in the selling price when you want ot sell it).
Normal wear is okay - a refret done by a pro is not a big deal (unless it's on an investment-type instrument) nor is the finish being off the back of the neck, etc.
Buying new is not something I recommend - you lose 30% (?) of the money you just spent as soon as you hit the sidewalk.
There are several dealers who advertise in Vintage Guitar magazine who are extremely reputable - I have done business with Gruhn's in Nashville (www.gruhn.com) Mandolin Brothers in Staten Island, NY (www.mandoweb.com) and Elderly in Michigan (www.elderly.com) plus have heard only good things about Matt Umanov in NY city.
They will give you an honest, realstic description on the phone and ship the guitar to your house, where you can play it on a 24 hour approval - if you don't like it (they won't question it if you want to return it) send it back - it costs you the shipping.
Hope this helps,
foo