I highly recommend the mud lite. I would go with the AT though...that's what was on my blaster that got stolen

. There are plenty of good mud tires out there but, IMO, what makes the mud lite the best choice for the blaster is that, as the name suggests, and as you wouldn't guess by looking at the tread pattern, the mud lite is actually relatively light for a mud tire. It's also plenty durable. Most mud tires are pretty heavy. That's fine on some big quad with a ton of torque to turn them...but the blaster is a small sport quad. Lighter tires=better throttle response! The only difference I noticed when going from 21" stock tires or 20" hole shots to the 22" mud lites were that they just hooked up!! Where I would nail the gas with the other tires and it would spin and go, with the mud lites, the front tires would be in the air. It really was noticeable.
Now, taller tires mean a slight loss in power and a slight increase in top speed, but I'll tell you I noticed no loss in power with the 22" mud lites. I wouldn't go with a 14 tooth front with the mud lites though, I've got stock gearing. If you're interested in running 20s, then yeah, running a 14 front is something worth thinking about.
If you ride on flat dirt roads all the time, 20s should be fine but if you like to get into all sorts of different terrain like I do, sometimes some pretty nasty stuff, then I definitely recommend the 22s. Heck I recommend the 22s just because bigger is always better, right!! This is coming from a jeep guy with 36" super swampers on his jeep, haha.
Oh and for the wheels, if you're on a budget, just throw em on the stock wheels. If you have a stock rear axle, in a hard corner the tire will flex and slightly rub on that piece that sticks off the back of the heel guard for where the black plastic part that breaks off real easily used to go. I just cut them off to solve the issue because I don't have those plastic guards on the back there, and haven't for quite some time. Wheel spacers would also do the trick, which I now have. Or, you could go with an aftermarket wheel that has an offset like 3-5, so the wheels would stick out just another inch on each side.