Ever since men were men, jeans were worn.
Need cheap jeans? Levi's. Cheap price, great quality. Here's some of the cuts you should be looking at:
The 511: Start here. This is the "skinny" cut, although in my opinion the name is a misnomer. It's a slim leg cut down from the waist to the ankle. It doesn't look like the "hot topic skinny jean" you're thinking of right now. http://www.youtube.com/watch?v=LAzEhlvNiko
Remember though, fit is everything. If you can't find a pair of the 511s which fits you properly (your upper body is too large or your legs are too large; look for something to compliment your body's natural lines) then you can either go for the 510s or the 501s.
The 510 is the Super Skinny fit. ONLY BUY THIS IF YOUR LEGS ARE TWIGS AND YOUR FRAME IS SMALL. Otherwise you just look like a girl. http://www.youtube.com/watch?v=e9TrTh_ulWI
The 501 is the Regular fit. It's straight leg down from the waist to the ankle. These are looser than the 511s. (can't find a good youtube video)
Okay so let's say that you have some more cash to put down. Now let's talk about rawwwwww denimmmmm.
Raw denim is simply unwashed denim. It is a single, solid color that is supposed to be worn quite frequently so the fades develop naturally to your everyday motions. In the end, these will turn out better than any pre-washed denim out there.
The best (and cheapest) raw denim out there is Cheap Monday. You can find a pair of raws for $60 that fit and look great.
If you STILL have more money to spend, some of the high-end brands include G-Star, Naked and Famous, and Nudies. Since this is a fashion blog for plebs, I won't touch up on this too much.
A final word on denim upkeep
Wash your denim as infrequently as possible. If they get dirty, then wash them with cold water. Don't put it in the dryer. If they start to smell, just febreeze it or something. Denim naturally smells odd. This rule goes double for raw denim (you typically should not wash raw denim until after six months of whoring it out).
Now go ahead and look awesome!