Not sure about final output of the ultra to the prime but when comparing the two producs on paper they are very similar w/ similar power capacity, driver size, enclosure size etc. I read somewhere that the cones were identical as the voicing but the surrounds where different and something else.See the post I just made quoting tony about mix n match. I suggested ultra surrounds here because of the large space. I feel for a balanced front to back presentation better surrounds would help that since the output of the towers in front, even primes, would benefit.
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I'd bet my ultra system that the prime setup would be able to play within the same parameters as the ultras. Maybe a 1 or 2db lower output but doubt the output would suffer.
Not really sure the difference to be honest, I'm not some speaker guru. I just feel on his budget the prime setup is the way to go.... and use that extra money to get bigger subwoofer. HT = demanding subwoofer = more real feeling.