Borrow a miter saw if you don't have one and do it yourself ...... seriously, it's that easy. From what U have posted of work done this is one of the easiest jobs u could do.
Get something to fit your hand and thats comfortable. If you have big mitts for example it's possible to pinch your hand with a smaller gun. Try them first then invest.
Check out Peavey Mart ...... They have an excellent compressor called an Iron Horse. This one used to retail for $1200 and last year I saw them for sale in their flyer for $375. This is a big boy compressor but works great. I have been running mine for a few years now with no issues.
Installed mine by myself as well. Very easy to do. One hint though is if you have a bimini to have it up while your installing to ensure it will fit. Took me an easy relaxed evening in the shop. Measure lots and drill once.
EZ Loader is your best bet. You can bolt on any add ons you want. You can easily make adjustments to fit your boat correctly at home. They are galvanized so no rust. Just go to their website to get the specs for what you need then click on a dealer near you to order. Brand new 3500 lb will run...
I know my neighbor bought rims and tires from tirerack.com they quoted him a price installed and balanced to his door. I think he paid about 800 bucks for everything for his 03 dodge. I also buy from summitric tho and he does give a great deal.