I test rode a Marin Kentfield today as a candidate for my first serious bike purchase and I love everything about it except for the fact that I'm riding so upright. My previous bike was also an upright bike but the top tube was a bit longer. Is it practical/possible to put dropbars on said commuter? If so, how hard would it be or how much would it cost to have my LBS install them?

Also, how much do low-end bars cost? What different types of drop bars are there? I've seen the perfectly round ones and the ones that look curved. I don't know too much about bikes yet so bear with the lingo, or lack thereof.

Oh and my LBS offered to sell me the Kentfield tax-free (or rather, he pays the tax) AND offered to sell me any lights/racks/locks/etc at 10% off. I'm starting to really like this shop.