I am keeping the old one, I love it. Rode it almost every day over winter, and really enjoyed it. It's pretty beat up though, and I don't like the forks, and the 1" steerer means it's hard to find good replacements.
Setting it up for track and keeping it down south meant I didn't have a fixed bike in the house at all.
Track Champ was a bargain, an upgrade, and is slightly shorter in the top tube, which will stop me looking like this (not a T-rex):
Have you considered a bike fit?