Tyler, My wife and I bought RXT's and ran them last season, and have just dealt with the issues that came up. They are 07 & 08 so I believe they have the same 1501 cc three cylinder motor as the craft you mentioned. Superchargers need service every two years, ($450.00) and there are some other maintenance requirements, not hard, but necessary for many seasons of riding. Our PWC's weigh most of a thousand pounds each, so they are big, stable even two up, and a comfortable dry ride on good water. Starting issues are a big can of worms. This is an electronic, computer controlled engine so any number of components are suspect. Spark plugs and coils need to be tested, and it's best to throw in a new set of plugs when you look at this GTI. At the very least, you need to pull the 3 &1/2 inch hose (ribbed for stiffness) off of the input of the supercharger and reach down there and try to turn the vanes at the front of the supercharger. If that turns freely, the SC has dropped one or both clutch discs into the motor and it's all in that "sticky". Read the old plugs for clues about how it was running before it was shut off. Black is rich or fouled, gray is good, white may be lean. They should all look the same. Old fuel is always a problem, and the list goes on to include a seized bearing anywhere in the drive line. If the outside of the boat is beat up, the inside will be worse. I would stay in the market and look at every thing that you may like, including this one. Parts for them are not cheap (or for any boat) and you will buy special tools and beef up what tools you already have but it's all good, and fun. The more you look the more you know. I didn't learn as much as I should have about these boats and their systems beforehand, but we are really glad we bought them. We are in Montana so we have similar riding seasons and requirements for maintenance. Get a premium membership to this forum and download and read the shop manual. Read all the posts in the 4 stroke forum that interest you and watch a few videos on maintenance. (3 feet deep is good, and you'll find more links on this site) Read the stickys at the top of the page. The one that applied to me was "Where did my clutch disc go??" It took me 4 months and over a thousand dollars to fix the problems left to us by a dealer that we thought was reputable, and, even if you find someone fast and honest, you will be saving yourself around a hundred dollars an hour shop time. That will buy you a lot of specialty tools and gas for your PWC and your tow rig.
Price is a tough one but do you want to spend $3000 on a craft that may need $1000 or more in money and your time, or spend more on a PWC that you can ride now. We paid over $6 thousand each for our used two and a trailer A new Spark is $5100 with a two year warranty, and maybe, dealer financing. Crunching the numbers can be fun too.