Ahh, the excitement of discovering new worlds!
To be honest, I haven't played MH but I just had to have it so I could build "shops" using the Savvy Seller objects that came with it. So, if that sort of lot building appeals to you, I would definitely have a look at MH but if you have any interest in building toys be sure to get the "Gold" version - the Toy Maker is not available separately.
As @Avatarit has said, if you have real money to spend you can actually get both Hidden Springs and Monte Vista together in a 'World Bundle'. Both are beautiful worlds and although HS doesn't have any special content (MV has the 'pizza' oven) it is a joy to play.
Of course, if you're the creative builder type then CAW could offer you just the challenge you want. I've never tried it, but there are plenty of Simmers and helpful websites around to give advice.
In more general terms of spending your 2000SP, if you haven't already come across it, I heartily recommend spending some time in the 'Store General' sub-forum and especially the DD and Cascade threads (links in my sig) where you'll find acres of information plus dozens of extremely helpful and friendly folk to help you get the best value for your points.
Good luck! :)
BTW, just to check - you do have Riverview don't you? It's free. :)
