There are a large variety of options available to you and though I have moved on to an adjustable scope I shot my 702 with a red dot when I first acquired it and it was a great match. There are a number of companies that make red dot scopes that will mount directly to the 3/8" dovetail "rail" that comes on the gun - BSA, NC Star...more. They are pointed T the 22 market. These will mount (depending on make) fairly low on the gun. If you require a higher mount there are 3/8" risers and 3/8 - Weaver rail adapters at a variety of heights and lengths. This is what I use for the cheek weld that fits my style of shooting.
The good news is that the possibilities are numerous. The real answer is "best" is what works for you and your budget.
Post up ideas or results - pics too. We love pics. I'll be starting a thread soon on a project I'm doing with my 702 - you can see pics of my setup there.