For those of you not into ink, Impressionists such as Degas and Van Gogh are timeless. I have always been a fan of Meunch's The Scream and have a large print of this masterpiece hanging in my foyer. More modern artists such as Keith Harring, Jackson Pollock and Andy Warhol can fit a variety of tastes and budgets. Photographers like Ansel Adams and Howard Austin Feld have amazing photographs to fit a variety of tastes and styles.
Do some research, shop around, check out a variety of websites. Don't be afraid to browse the likes of www.posters.com but most importantly do not skimp on a good frame and paying the extra cash to have your print mounted properly at your local frame or art supply store. More often than not the proper mounting and framing make the print stand out and give it that unique look.
You don't have to break the bank; spending on one really seminal piece that speaks to you and going the extra mile to have it uniquely mounted and framed says volumes more over a handful of tacky prints you purchased in the college quad and mounted yourself.
This is a no thumbtack zone, go the extra distance to properly hang your new print. Take the extra care to ensure that it is mounted straight and in the middle of the wall or evenly distanced from other wall mountings (you may want to purchase or borrow a level or laser mounting device).
Remember, less is more, and the less chatchkies cluttering your apartment the better.