T1 is a beefier boot than the Synergy, but fit is more important, which one fits best?
As for binding, yeah, everyone has a preference. First issue is whether you like an active or passive binding (which I am sure you don't know yet). Personally, I don't like the G3, I think the design is outdated and they are not as durable as some others. Cheap option would be the Voile Hardwire (or hardwire 3pin if you do a lot of backcountry). The BD binders are fine, I guess, I stayed away after their first year when they had lots of trouble, so I don't know much about them...