Choose Bicycle for Indoor Training

I just got into indoor training. My current setup is Wahoo Kickr with 1996 Cannondale M-400 with front suspension fork, 26" wheels and Shimano XT (8 rear: 11-28 with 3 front).

Obviously this setup works, but if I wanted to get a better bicycle for indoor training and occasionally take out this bike on roads and compact gravel trails, what would you recommend.

Say my budget was $2000-$3000

Something like Cannondale Topstone 105 or Synapse Disc 105 or CAADX 105 or CAAD!3 105 or CAAD13 Disc 105 or SuperSix EVO Carbon 105? Or am I completely off?

Thank you.