I acquired a pair of MG 12's recently and am very happy with them. Just a few things to keep in mind...
1) make sure your amp is up to driving the maggies,
2) placement is a bitch. Moving the speakers half an inch will affect the sound. It took me about 2 months to set them up properly.
3) the speakers are not forgiving. Poorly recorded cd's sound horrible. Conversely good ones are awesome.
4) Replace the tweeter jumper. I made a jumper using Kimber 8TC cables and banana plugs. I think Cardas makes jumpers also.
Good Luck.