I installed Kate last night and am using it now. I'm making notes as I go along but over-all I like it - and it's far faster than Quanta. I'll post my notes when I've used it a little more.
I've also brought up Bluefish again, which I tried after Quanta annoyed me with its slowness and then went back to Quanta because BF annoyed me more. Can't recall exactly why now but I think it was because it frequently died, although that's only from a poor memory.
The trouble is, I'm happy with Quanta except for the speed when editing large files. :( Luckily Kate looks to be quite close to Quanta as a user interface.