Definitely build it. I bought this dual tap system
and installed it myself. You may even be able to save a few bones by purchasing the items individually, but this was a nice all-in-one package. Then all you need is a fridge (go to craigslist). I found one on Craigslist for free, and it turned out being an old vintage fridge that was pretty nasty, but after a good bleach cleaning, sanding and painting, it turned out awesome!!
Fermenting/Conditioning: Casc/Cent APA, Hoppy Birthday Amarillo/Simcoe IPA(6g American/5g Belgian), Chappist Belgian Dubbel
Bottled/Kegged: Red Rye IPA, Wesside Trip(Westmalle Tripel clone), ESB, Lil Trap (4% Trappist Starter Batch), Robust (Pumpkin) Porter, 3% Little Hopper, "Slick Rick" Old Engine Oil Clone(oaked w/ vanilla and balvenie scotch), Imperial RyePA,
On Deck: Quad, Belgian IPA, Orfy's Mild, Scotch Ale