Unfortunately, what you want is completely incompatible with the price you're willing to pay for an airline ticket... and likely the amount of time you wish to spend traveling (hub-and-spoke model takes a lot longer than direct flights, due to layovers, boarding and deplaning, etc, and offers fewer departure/arrival times).

Also, a modern 737 can be very comfortable - it depends on the interior layout and choices the Airline (not Boeing) made when leasing the aircraft. Airlines are responsible for the interiors...