Scooby,
I got this one:
http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200327449_200327449
Right now it's on sale for $90. I think I paid $100, but I got free shipping, so it works out. Heck, maybe I paid $120.
For the consistent grinds (teeth length, etc), I get out my calipers and set them to the smallest tooth. Then, I go through and file all the teeth until they are all the size of the smallest (on both sides).
I've also got the $10 Dremel tool sharpener attachment, and it works pretty slick as well. I used to use this and the caliper to get close to the size, and then grab the file to fine tune it.
Now I do 3-4 sharpenings (usually out in the woods with the chain on the saw) by hand and I'll take the chain off and clean everything up with the Northern Tool sharpener.
Heck, I can sharpen the chain faster by hand then I can take the chain off the saw and put it back on. But, when I take the chain off to clean up the saw at the end of the day, that's when I'll put it on the electric sharpener.
One place where the electric grinder really excels is doing the rakers. I took off a little extra on the rakers to make the saw cut faster, but having them all the same height quickly and easily is really nice.