At least you all recognize that Maggies need high wattage and basically deliver what you put into them.
I would suggest the best pre-amp you can afford. Audio Research has been known for quality pre-amps since the 1970's, so maybe try out one of theirs.
As for the Carver's, I have not heard them, but if they are neutral in all frequencies, you should be OK. As for power, it would be pretty much impossible to have too much to drive them with. Remember, it is POTENTIAL power until you turn up the volume! The more power (wattage), the crisper and cleaner your system will sound with Maggies.
Enjoy! You have the best (most accurate) speakers made, period.