The [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFBH5&P=0]Reedy[/link] - like most of the other motors we tend to recommend here - is about $40. If you clean it out once in a while it will last you a long time. A can of motor spray is about $5 and should last you quite a while - spray out the motor every couple of runs in the dusty conditions that a buggy usually sees and keep it lubed. Don't get oil on the comm where the brushes contact or it will arc - just a tiny drop at each end bearing after you spray it out - too much oil will just give the dirt something to stick to.

It's rebuildable so you can have the comm cut and the brushes replaced when the performance starts falling off - most shops will cut the comm for about $5 - 10 and the brushes can cost anywhere from $5 - 15 depending on what you choose. For long life I would suggest the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJUP8&P=0]Trinity Lemans XXX brushes [/link] - they have a high silver content so they conduct a lot of energy but they are hard enough to wear for a long time - they last about 3 to 4 times as long as normal brushes for me and I really like to not have to work on the motor regularly (lazy, ain't I?). You will probably get 20 - 30 runs between comm cuts and the comm can be cut quite a few times so you can probably get a couple of years of bashing or racing out of it before you need another. If you go too long between comm cuts the comm will get out of round and everything will wear faster - no big deal but the performance falls off pretty fast at that point.

As far as the glitching - it sounds like your P2K doesn't have the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJY65&P=0]capacitors[/link] on it. The older P2Ks didn't come with caps preinstalled - the new ones have the surface mount caps (tiny little 5 x 8 millimeter tan things with silver end caps). If they aren't there then you need three 0.1 uFd (microfarad) 100 volt capacitors - follow the link or get them from any electronics store or most Radio Shacks. They go on this way: 1 from + to - on the motor, 1 from + to the can, and one from - to the can (the can being the case of the motor). The ESC may glitch without them and that will create radio interference too.

The problem could also be caused by loose electrical connections - check that all of your battery and motor connections are tight. Also check that you antenna wire on the chassis isn't crimped or damaged anywhere and that it isn't running up against the ESC or the servo - that, too, can cause interference. If that doesn't cure it start a new thread about your glitching problem and we will try to help you figure it out.

Before you give up on the P2K try gearing it up. You can probably go up 2 - 3 teeth and maybe more from the factory gear for the 15 turn stocker that came with it before it gets too hot and that will make quite a difference in speed.

Just out of curiosity - what batteries and charger do you have?