No one knows how long you can keep this going, although TRT is generally for life. So, if you're not prepared to devote yourself to TRT for the rest of your life, you should not be considering this.
Start with 1 mg/week of Arimidex and go up from there. Of course, you'll be getting lots of blood tests, right?
Just to clarify, you don't suffer from low T, you just like the way you feel while on....?