I'm thinking about replacing the neck on my SG. It's a bolt-on. Something relatively cheap but of good quality would be nice. Any advice on what I should get?
Dido for Warmoth but make sure to measure the neck pocket to see if its fender spec or not if so then options are endless and you can find a replacement rather cheap but if not fender spec either call or email Warmoth or see if who ever made the guitar sell replacement necks or if they could tell you how and where to get one.
It's not worth putting much money into a bolt-on SG. The money's much better spent on a set-neck SG, and there's great deals on used ones that are easy to find.
I've had good experience with Stewmac necks, however I think they just do Fender spec, Warmoth may be a good try but I believe they are also Fender spec only so your last try would be eBay, always be wary of the seller etc though.