I play a Martin D12-28 (28 because I dislike bling on guitars).

I bought mine second hand for about half the normal UK price. It was unmarked.

I stuck Martin Marquis 10-48 strings on it and it's without any doubt, the best 12 string I've ever played.

The action is good, volume and tone are excellent. I've now tuned it down a full tone to get more bassy bass - it's fun too.

I know they're a lot of money, but once more, the old adage applies 'you get what you pay for'.

Well recommended.