Jesus, don't buy another TNT, those things suck.n Clearly if yours has been in storage for 20 years, there's a reason for that.
$200 is still pretty hard to get anything decent. It is possible but you really have to ride craigslist daily and be on the lookout for undercover deals. I picked up an older Carvin PB-200 combo (1x15 w/tweeter, 160w) maybe 3 years ago for $180 (guy was asking $200 or $220). It wasn't anything special, but it wasn't too heavy (60 pounds maybe?), was compact, and was plenty loud enough for rehearsals and small gigs. I ended up selling it recently for $220.
But yeah, really if you get up into the $300-400+ range, your options open WAY up, especially if you are still scouring CL for deals and hop on them fast. Just search for "bass" and look at every ad that pops up.
And do some research, FFS. That's what we have the internets for. Figure out which of your available options seem like strong contenders, and then you can ask here about pros and cons of each and what people would go with in your situation.
The people that have the most success with gear are the ones who don't NEED others' help because they find out as much as they can on their own FIRST, and THEN ask for opinions to tip the scales one way or the other.