Hi Adamsdp, and welcome to the sailing forum; by no means I am an expert, but what I've learned in the little time I've been in sailing is that basically if you want tons of fun and support your boat a lot has to do with what your local fleet/club sails. Sailing solo is fun indeed but if you have interest in racing you may want to go to www.modelyacht.org/ which is the web site for the American Model Yachting Association (AMYA) and find the clubs in your area and see what they are sailing that way you can race and get tons of support and transfer of knowledge as well as unending fun. Also If you go to the AMYA site, you will find a comprehensive listing of active racing classes There are many inexpensive boats out there but after you invest in all the mods and upgrades the cost comes equal to or higher than some of other great options, for example I have a CR-914 (distributor's site www.rcyachts.com/ class site www.cr914class.org/ ) and with this kit all you need is the water to sail it, it comes with everything needed yes that includes the radio and electronics. Also to my advantage the local fleets races this same boat. I bought it with the following points in mind: Easy to build, Better than average performance, Fits in most cars, Fair amount of class activity in my area and cities all over the US, Reasonable price (though probably more expensive than some models that others may list), Everything you need is part of the kit, except for paint, Very rigidly controlled design - you can't change the sails, the rigging, the keel, rudder, or hardly any other features of the boat. This means when you race you compete against very similar boats (levels the field, skipper’s skills and tuning determines the outcome and not the size of your bank account).
Again there are many great yachts out there, I will say that you can buy whatever you happen to like, but if you think racing would be fun, then you are going to want to buy a boat in the same class - design - as the rest of the competitors. So find out what your local fleets are sailing and maybe we can help you narrow it down from there once you have a list of options.
Good luck and welcome again.
Chas

Edit:
Here is a good getting started article http://www.modelyacht.org/start.html