I'll just add that there are dozens of quality bikes between $1400 and $3600.
If the topstone isnt what you want, that doesnt mean you need to go to a $3600 bike. Maybe something that costs $2k or $2500 will be great. Even $3000 for example will get you an incredible bike and still save significantly over the Giant.
Also, if the topstone feels heavy, for less than $500 you can get a wheelset that weighs 400-600 grams less(depending on which wheelset you choose). That will shave off a pound +/- and you will feel it when accelerating from a stop.