I've got all manner of bars on my different bikes, but for the kind of riding you're describing, I'd choose flats. The best part is how vast and varied the options are -- "flat" bars now come in all degrees of rise, width, forward sweep, backsweep, and upsweep, so with some trial-and-error you can really dial in the fit, comfort, and hand positions to your liking. My recent favorite flat bars are Soma Dream Riser, Ritchey Koyote, SQLabs 30X, Jones, and Surly Terminator bars. Each is unique, and each affects the feel of the bike in a different way. Have fun!