It's not a massive difference between the 2hp & 3hp but it is noticeable, keep in mind the Crown XL can ONLY be hooked up 220v. $5,900 is a fair price, I'm a few hundred higher but I usually include the Mood Light Package on top of the Nordic Wrap, Cover, Steps, etc.
Tough call to get a spa now or wait a year just for the larger pump, I can say that I do sell a lot of Warrior XL's, it's usually the round option from Nordic that I like to keep on my floor and I've never had anyone come back with "Jets are weak" or anything like that. Nordics are great reliable spas, can't recommend them enough for the price they sell for.
Good Luck!