I believe the 400+ can run either 8 ohm or 4 ohm loads. So you could get a single 4 ohm 4x10 or 2x15, or two 8 ohm versions of each, or a combination, or two 8 ohm 2x10's, two 8 ohm 1x15's, or a combination, or two 8 ohm 2x12's or an 8 or 4 ohm 4x12. As long as the cab is of good quality, like Mesa, Ashdown, Ampeg, Peavey, etc. you should sound pretty good.
If you buy the 400+, schlep it over to a music store and try some cabs. Make sure not to power it on with no cabs connected, though.
If you buy the 400+, schlep it over to a music store and try some cabs. Make sure not to power it on with no cabs connected, though.
