I'm hardly an expert on DC in general or Green Lantern in particular, but I do have two recommendations:
Will World by J.M. "Spectre" DeMatteis and Seth "Vertigo Pop: Tokyo" Fisher - A young Hal Jordan, new to the Green Lantern Corps, must undergo a particularly surreal rite of passage. I know that doesn't sound particularly exciting, but just wait until you see Seth Fisher's art. It is, in short, stunning, with complete insanity bursting forth in all directions. The cover I've posted simply doesn't do it justice; make a point of flipping through this at your
local comic shop or bookstore.
DC: The New Frontier - This is a stunning mini-series written and drawn by Darwyn "Batman:TAS Kicked Your Fanboy Ass" Cooke, envisioning the DC universe just before the dawn of the Silver Age in the mid to late 1950s. A whole slew of folks show up, but in particular the series is about how Hal Jordan became the Green Lantern. The end results are drop dead gorgeous. Here's a sample:
No Hal Jordan in that pic, but you get the idea. This is being a released as a six issue miniseries, 64 pages each, no ads, at $7 a pop. Rest assured, the price for each issue is well worth it. With the fifth issue due out any week now, you may want to wait for the trade, but, let me tell ya, this is truly worth going out of your way to read as soon as possible. Fuck waiting! This is too good for waiting. If you're a Green Lantern fan, you're going to positively eat this up, so see if your local shop can hook you up. But, hey, don't take my word for it -
there's a solid preview waiting for you at DC's website.
FnordChan