I use the Four Paws clipper and I love it.
Amazon.com : Four Paws Magic Coat Super Mini Nail Clipper : Pet Nail Cauterizers : Pet Supplies
It's really sharp and doesn't crush the nail or splinter it. I thought about a Dremel, but didn't want to deal with my dog having to be good long enough for me to actually grind her nails. I wanted something quick and sharp and these clippers are great, and they happen to be cheap too LOL.
They have a guide plate so you won't cut too much nail off or you can cut them evenly. I don't really use this anymore, since her nails grow at really different rates - it's weird. But, it was really handy when I first got her and she was seriously NOT into sitting still for me. I could grab her paw and put the nail up to the plate guide and quickly snip.
I was tired of paying Petco $10 a month and having her come home with hardly anything cut off her nails. It's like they didn't want to deal with her and still charged me.
Now, she's good about sitting while I do it, since every time I have done it, she gets an entire Beggin' Strip afterwards! This is the treat she loves and very rarely gets, and usually only 1/2 a strip. So, although she still doesn't love having it done, when she sees the orange clippers come out, you can see her little brain thinking...yikes! No wait! I can do this! Beggin' Stips!
Edit: Oh, forgot to mention my dog is a 22 pound rat terrier.