There are plenty of ECU options available. It really depends on what you want and how much you wanna spend. Also if you´re not too deep into that topic it would be the best thing to discuss with a tuner to be honest.
The remapped standard ECU would be a very good and cost effective alternative. But since you decided you´re not willing to use RSP you will have to look for something else as they are the only one who can do it. Don´t know what happened and don´t even want to but maybe just give them a ring and a second chance? I´m sure you´ll be happy as Richard and Damo are top guys. Personally I´ll never use anyone else for mapping my car.
Good luck mate :cheers: