+1. I always liked DME better - it has longer shelf life and often paler color. I find Briess DMEs to be the best, both in flavor and fermentability (~ 80%) - I would use ~ 7 - 7.5 lbs of Briess Pilsen DME here for a 5 gallon batch. I know you mention using extracts, but you'll make a much better IPA by steeping 8 oz of crystal/caramel malt 40L in a couple quarts of 160F water for 30 minutes, then straining the liquid into your brewpot, to add along with the extract. It's very easy !
I would bitter your beer with an oz of Columbus hops for a 60 minute boil. There are many,many good choices for flavor and aroma hops - Cascade, Centennial, Amarillo, Citra, Simcoe are great choices, among many others. I would do some reading on the various types of hop flavors and aromas found in today's hops, decide what you like or want, and we can help you figure out a hop schedule. Good luck !