Tough call. Yes the Ruby will ride smoother, aluminum is less forgiving. It has a better component spec. Yes it weighs a few pounds less. I would say, that if you test rode it and it felt better- enough so that maybe you would ride it more or enjoy the ride more and be happier with it, it might be worth the upgrade. These things, only you could qualify/quantify. The differences are not earth shattering. They are subtle. But when I test rode the Dolce and the Ruby (own a Ruby Expert), and a few other bikes, something made me keep coming back to the Ruby. My price range was Dolce, but my heart said Ruby. It just felt better and I reworked my finances so I could own it.
You know, we all make compromises in our lives to juggle our needs and wants and responsibilities. Sometimes, good enough is good enough and we make do. If you are happy with the Dolce (and it sounds like you are) maybe you should stick with it. But if you ride that Ruby, and it's like lightning striking and birds singing and angels winging along side and you really want it, go for it. Yep. Tough call.
Tzvia- rollin' slow...
Specialized Ruby Expert/mens Bontrager Inform RXL
Specialized SWorks Safire/mens Bontrager Inform RL
Giant Anthem-W XT-XTR/mens Bontrager Inform RXL
Fuji Newest 3 commuter/mens Bontrager Inform RL
Novara E.T.A commuter/mens Bontrager Inform RL