bazooka amp and subs

What kind of box are they going into (i.e. sealed, ported/vented, bandpass, etc.)?  That amp will work just fine if you don't plan to listen to it super super loud.  That's really what it all comes down to.  I used to have 2 10" subs in a bandpass box, getting 100 watts each and it was definitely loud enough for me.  But that's just me and my tastes, and I don't know if you're the type that wants it loud enough to hurt your ears, or just loud enough to thump real good...

Anyways, from your post it sounds like you are going for something that's as loud as possible, and in that case I'd suggest you at least start out with the equipment you've already purchased and listen carefully to it.  If it goes loud enough for your tastes then there's no need to get another amp.  If you find yourself wanting it so loud that it starts distorting, then you know you'll need a bigger amplifier if you want to have it that loud.  Distortion is not something you want to have happen on a regular basis as it can eventually lead to damaged components.