There is only one "right" SRA and that is 92 degrees. Not all records were cut at exactly 92 degrees but unless you want to drive yourself crazy it is the best average setting. Expensive cartridges are easy, as long as the headshell is parallel to the record you are good to go. Cheap cartridges unfortunately vary wildly from right on to defective. You have to look with a microscope and measure the angles another impossibility for most people. The most inexpensive solution is the Wally Reference but it assumes the cartridge was built correctly.
@rvpiano , If you think it sounds good now save your sheckles and get a decent cartridge.