Rt1000i advice

I'm a newbie and could use some advice.

I've got the rm6900 satellite set up going, but added rt600s as mains to go from 5.1 to 7.1.

I think I can get a good deal on a pair of RT1000p. Are these any good? I know they're old, but I'm entry level and my rt600s are old too. A step up from what I have?

I figure I'd just use the rt600s as mids, move the 6901s to the rear and take the little rm20s out. ...