I have a hammer and a turbo vee II. Both are good boats, the hammer is a little bigger, but basically the same setup.
same motor, esc, propeller etc. If you take care of the boats they will last a long time and it will be easy to find replacement parts when things break. Both will do about 14-15mph with a 7 cell battery pack and everything else stock. Its not racing speed, but fast enough to have some fun. You can always upgrade these boats and have them running closer to 18-20 mph. A lot of guys will rip on these cheaper boats (I also have a nitro hammer, a 14 volt cen wave shark and an electric tunnel hull), but all boats are fun, and for the money, you will have tons of fun with either the turbo vee or the hammer. The hammer comes in more colors and a wide choice of frequencies. All of the turbo vees are yellow, not sure on the frequency in case you wanted to run more than one at a time. I cant comment on the traxxis blast, since I have never owned one.