It's not so much the question of which is better in an abstract sense, if the Tiagra shifters will really work for you and the Deore ones won't. $130 seems to be a decent retail price for the SL-4603 shifter set, just from a little googling. What would get my hackles up a little bit is them not taking your OEM shifters in trade ... but only somewhat, since as I said it's not universal that shops will do that. I had to eat the cost of a crankset to get the size I needed on my new Synapse, so it does happen. (But at least I knew in advance when I ordered the bike that I was also going to order and pay for the crankset.)
More importantly, I'm not hearing you say you're sure the Tiagra shifters will work for you. Did you try a bike that has those shifters?
Last edited by OakLeaf; 09-08-2013 at 07:29 PM.
Speed comes from what you put behind you. - Judi Ketteler