Vienna is my choice for session ipa and frequently SMaSh beers, you get more color and flavor vs 2-row without having to use specialty malts, which can be very easy to overdo in a lower abv beer.
Pick a new hop you've been curious about trying anf go for it. Or a new yeast, or both! Or try out a new method like doing 100% hop burst, or all FWH....having extra ingredients is a great way to play around
Most of my SMaSH beers i do no sparge brewing, at 60% efficiency I am usually around 12-13 lbs for 5 gal of 1.046-1.050 ish beers, at 70%+ you would be able to get there on 10lbs.