Hmmm ...
Personally, I've never subscribed to the thought process that McIntosh has a house sound or that newer generation Mc amplifiers
sound different than prior generation Mc amplifiers. Quite simply the
sound of a McIntosh amplifier is a function of its frequency response and its ability to achieve synergy with the load. Time and time again, it's been proven that McIntosh excels at both. I've also owned a few hundred different McIntosh power amps over the last three decades and have never noticed one sounding remarkably different than the rest. So then other factors like S/N, power capability, mechanical ID, and flexibility are determining factors - at least for me.
So ...
@kevzep and
@4-2-7 are both right. Each makes good points for their argument and each is obviously passionate about the amp they own / have owned. Now, I've never owned either amp in question and have zero firsthand listening experience with either so I can't say definitively that one is a better choice than the other.
OP - given your budget, the MC402 is your amplifier. However, if you're patient and if you can stretch the budget to reach the MC452, you'll find a deal you can live with. The latter would be my choice here - simply because I find the MC452 to be the single best piece of eye candy to come from Binghamton since the MC500.