Hi Philjolet,
Yes, the stingray with its 5 ohm impedence out mates with the 4 ohm Maggie. The Manley does very well dynamically. I had one on my Usher 6371's and could be living quite nicely with it now if not for that dreaded upgrade bug!
I wish I had the Manley when I owned the Maggies. The funny thing is...I was looking for both amp and speaker at the time I heard the Maggie/Stingray combo at my dealer, I almost bought them both, but couldn't bring myself to buy Maggie 1.6's for a third time in my life! :-0 ...so I bought the Stingray and found the Ushers later( which really was a bit more synergistic overall)
BTW.. I like your system. somewhat similar to my own in some respects with a Rega on the Linn(mine is a Origin Live Silver on a Thorens 125) and the same Muse 9 Signature, which is quite good!
Hazel motes-
If you can find a pre owned Stingray, it will be worth the search.