My main guitar lately has been a cheapy Gibson Les Paul Melody Maker, 2011 version. Replaced the humbucker with a Dimarzio Tone Zone and it sounds really great. Simple set up, 1 humbucker and a volume knob.
Got it for under $300. Stock it sounded decent, but the clean tone was a little off. Found once I switched to the Dimarzio pickup, it sounded a lot better to me.
Only thing I would do different on it is to put the input on the bottom, the placement is kind of weird to get used to. Maybe move the humbucker up a small bit from the bridge.
But those are just nitpicking things... it plays and sounds great to me anyway.