I reciently heard a JL woofer at 500 watts..it totally blew me away. The guy was going on about how 500 true watts is more than enuff for most people. Personally..the next woofer I get will probably be a 13w6v2.
Do you actually have the amp yet, or are you just intending to purchase it? If you haven't bought it yet, I'd recommend going with something a little more electrical-friendly unless you're looking for balls to the wall SPL... 3,000 watts would do just fine for either of those subs you mentioned - even 3kw might be a little excessive for daily on one sub though.
If you're dead set on a maxximus, you should probably get a sub that's a little more geared towards SPL to handle the abuse.
Sure go with a jackhammer and shell out 5 grand for it. pfff, i say go with the new olympus subs, 2-4, Or go with 2 brand new maxximus subs and yur set.