There's quite a few solid options around the $1k mark if you want to start there and work your way up.
It also depends on what kind of tube amp and sound you're looking for. Do you want to tube roll a lot? Do you want a cleaner, more neutral sound or something much more lush and "tube" sounding?
Not sure I’ll want to tube roll a lot (assuming I understand the term correctly). I’d lean more towards neutral but with some lushness.