A great design that's easy to homebrew and works very well is the Quagi, originally published in 1977 (QST by N6NB. The Quagi design was in the ARRL Antenna Handbook and the VHF-UHF Manual for many years and there are many thousands in use around the world.
Complete details are on Overbeck's website http://www.n6nb.com
The nice thing about the Quagi is that it requires no matching device for the driven element, and provides a wonderful match at the "SSB end" of the two meter band without one. This saves time, work, money and helps prevent the biggest mistake most hams make in homebrewing VHF beams, which is improper matching device construction or adjustment.
If you opt for a commercially made beam, the smallest, lightest, easiest-to-rotate, highest-performance 2m beam on the market (balancing "most bang for the buck") is the M2 model 2M9SSB. It works extremely well for its diminutive weight (only a few pounds), only takes about 20 minutes to assemble and is very well designed with a matching system that literally requires no adjustment other than setting it up dimensionally according to the instructions. Info on that, and other M2 antennas, is available at http://www.m2inc.com
Remember your antenna system is by far the most important element of your two meter station, if you want to "DX" on this band. And it's the whole *system* that counts: Antenna, its feedline, and its elevation are all vitally important. Use the lowest-loss transmission line (coax) you can, get the beam up as high above ground as possible (and "higher than possible" works even better!), and use a good beam and strong rotor (to minimize failures and maintenance) and you're going to love what the 2m band can produce. With 25W PEP to a good antenna system, daily, typical contacts to 200-300 miles are normally commonplace, unless you live in a very poor and blocked location.