Any thoughts on using 200s for bi-amping?

I currently use the 950 and 755. I had planned on going to a 7.1 setup sometime in the future and using a pair of Aragon Palladiums to drive my mains. If I used 4 200s instead, it would push that expensive purchase way into the future. While I currently drive the mains at 200w I'd like to move to their rated 400w.

What are the downsides to this? Is using a y-connector to 2 amps a problem?

Also, I noticed the signal to noise ratio is quite a bit lower than the 755. What does that mean in practical terms? Thanks.