I can certainly say that the NuPRIME amps "will" certainly make your Maggies do what they were designed to do, but comparing a 100wpc amp with a 300wpc amp will not demonstrate the potential of NuPRIME.
Maggies are Power Hogs and thrive on high power and damping ratios. You would certainly benefit from moving to the IDA-16 or the ST-10, but if you REALLY want to get the best, a Bridged K-38 (as Evoke suggests) or the new ST-10M (monoblocs) would likely be all you would EVER need.
If you are on a more rigid budget you could do well with a pair of STA-9's bridged to mono (290wpc), but I would seriously suggest the K-38, especially, if you are doing any Multi-Channel.