If you read above I'm not trying to change A/C types, just adding another. Also I don't want to go after smaller jets as I'm trying to keep my maintenance down as much as possible so I can charge less on routes. I'd be interested in order the A321 for trans-atlantic routes in the future maybe, but I don't really want to go larger than the A319
You seem to be really focused on the 100- to 130-seat market, and in your game, it is fall 2000. If you're adamant about avoiding the Airbus A320 family because of its size, but don't want regional jets, I'd recommend the 717-200. It has a max capacity of 134 (around that of the 737-600), and it has a shorter turnaround time, less runway use, and a much lower price and roughly the same fuel flow (depending on which engines you pick). It ends production in 2007, but for now, it should be a good aircraft with less of a maintenance cost.