For Def Tech speakers - I'd think anything above and beyond YAMAHA would be over-kill.
In all seriousness, your best bet will be to mix and match. Marsh together will give you incredible transparency, speed, accuracy, control, detail, and dynamics (am I missing an adjective??).... but it wont give you the warmth and draw of tubes.
The Mac will give you a lot, but the particular model you are looking at may not give you the punch and speed your looking for. Think of it as a super Jolida.. ?
Get a good solid state amp - get a tube pre - and be done with it.
edit: Gentlemen, it may best suit your interest to know your dealing with a 13 (soon to be 14) year old boy who for now, enjoys old rock (Led Zepp, AC/DC, et all) and more modern rock bands (Weezer). Like most kids, he wants to jam out, so power is a big thing here.