Aam,
Hello, as far as enlargers, stability of the enlarger head is more important than anything else. If you get a cheap enlarger and the head is wobbling around, you will never get a sharp print. That said, I wouldn't invest much money in the enlarger since once you learn the basics of enlarging, it's time to switch to Digital!
I will assume that you are shooting 35mm film and a standard lens would be a 50mm or a 75/80mm for the enlarger. The wider the lens(50mm) the larger the print you will be able to make. If you only will be making 8x10's, I would get a good 75mm lens. This will get the head of the enlarger higher off the easel and give you more room for burning/dodging the print.
As far as the enlarger itself a good basic one would be a Besseler. And the lenses are what you can afford since the lens really controls the quality of the final print. Maybe $50-75 tops for a used lens. Good luck and I hope this answers your question,
Rich Franco
www.richfrancophotography.com