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@danb
You should be able to run the new amp in 5.1 mode fine.
You can then add additional speakers to take it to 7.1 (or .2 with an extra sub..) - the amps usually have a hideous number of configurations etc to deal with all the possible variations.
I would say that 7.2 is overkill for a small / non dedicated room (in fact I would argue that for 95% of movies a 2.0 or 2.1 system is far better than 5.1)
I would also worry about trying to match up sub resopnse using 2 different subs - for effects speakers you should be fine, but getting crossovers and positioning sorted with 2 different subs will be challenging. There is also the fact that at the frequencies that a subwoofer operates you only hear in mono anyway.
If you want to spend more on speakers - I would perhaps upgrade the front's and then the sub and last of all the rears.