He definitly should stay on the $10 bill. If we put Reagan on anything, it should be the $1,000 bill, that way only people helped by trickle down economics and other economic policies of his will have to see it.
Actually, if I had my way, the only existing bill I would change would be to place Henry Clay on the $50. All of the other bills have a good connection between the person on the fron't abd the scene on the back.
Now if we get some denominations higher than the $100 bill I'd want them to be chosen from the following combinations:
John Marshall - The Court Chamber of the Supreme Court
Theodore Roosevelt - Old Faithful in Yellowstone NP
Dwight D. Eisenhower - Omaha Beach on D-Day
The main reason I would be against placing Reagan on our paper money is that there is no good reverse image to put with him. The same applies to FDR as well.