A 3 channel amp would be the easiest solution as far as electrical outlets(one plug instead of 3) and space on a stand/rack. Monoblocks might offer the best performance, though with a good 3-channel you'd be hard pressed to hear a difference.
It also might depend on your speaker model, with many types you might not need 200 wpc, or might need a more robust amp if they dip down to 2 ohms for example. Size of room and volume preferences would play a part as well.
I've got an Onkyo 876 that I use as a processor with an Outlaw Audio 7125(125 watts per 7 channels) and it's more than enough volume for my speakers and room. If the Integra has the sound characteristics similar to my flagship Onkyo, they are a bit on the forward or bright side in SQ. If your speakers are also on the bright or harsh side at high volumes, some amp brands could worsen the issue.
It also might depend on your speaker model, with many types you might not need 200 wpc, or might need a more robust amp if they dip down to 2 ohms for example. Size of room and volume preferences would play a part as well.
I've got an Onkyo 876 that I use as a processor with an Outlaw Audio 7125(125 watts per 7 channels) and it's more than enough volume for my speakers and room. If the Integra has the sound characteristics similar to my flagship Onkyo, they are a bit on the forward or bright side in SQ. If your speakers are also on the bright or harsh side at high volumes, some amp brands could worsen the issue.