The 2 does have better parts than the 3,and almost identical gearing. 8spd chains and cassettes generally last longer and are cheaper than 10spd,but 10spd prices have been coming down. The 2's hydros will require no adjustments or cable maintenance;you'll just replace worn pads and have them bled every few years. I personally prefer SRAM trigger shifters because both levers are actuated with your thumbs;this makes it easier to shift with heavy winter gloves/mittens,and lets you ride in heavy traffic covering the brakes while still being able to shift.

As to whether it's worth another $200,can you afford it? The 2 will be 'nicer',but the 3 isn't junk.