As for estrogenic side effects, letro is the way to go. It binds very strongly to the aromatase, much stronger than ATD. Nolva is good for inhibiting gyno, but the addition of letro should help that situation as well due to lower serum estrogen levels.
Just remember that inhibiting estrogen will actually make you gain less. Estrogen, although it has some negative side effects, actually has a lot of benefits while on cycle such as increased strength, better skin, etc.