i'm interested in purchasing my first tandem bikes. i've been riding road bikes for 12 years, and raced for quite awhile, and now race occasionally. I have several bikes, including 2 nice road bikes (and a TT bike, track bike, around-town fixie, and a cyclocross bike). my girlfriend has only been cycling regularly for 4 months, but she's adapted to it quite well. we just got back from a trip to maui, where we rode 260 miles and climbed 28,000 feet in the 4 rides we did there. we rented a tandem bike last weekend and enjoyed it. we're planning on renting it again this weekend to make sure we still like it. i'm trying to figure out what kind of tandem bike to get. it seems like people often get used tandem bikes for their first bike, but the two good options locally (in the san francisco bay area) that look appealing to me are a 1988 santana arriva tandem bike with 9-speed dura-ace components, or a 2010 cannondale road tandem 3 (that has lots of tiagra components). Both are about $1400-1500. These seem nice from the perspective of being a low cost entry point into the tandem market, but seem to have the downside of being heavy (i prefer light, as i guess most people do) and/or having low-grade components (tiagra for the cannondale). my other option is a new old-stock 2010 santana sovereign with a rear disc-brake and the "elite performance package," which i can get on sale for around $4200. to me, this option seems appealing as the components (mostly ultegra-level components) seem to be pretty good, so i wouldn't feel like i would need to upgrade anything immediately. the downside seems to be the extra expense, without knowing how often we will really go tandem cycling. right now, i try to do around 200 miles a week on my road bike. i wouldn't mind trying to do the tandem about once a week or twice a month. kind of struggling with the decision. any opinions as to the best option? or other options?