Depends on what you'll be using it for. Are you going to sell your own cleaner, or pre-sell another as an affiliate? And how will you be advertising?
I think registryrid.com is mush better compare to other example as it has keyword itself in the domain name which can also help to push the site to have better serp ranking.
yes, it is mine tool. want to brand it. abiel: reg means registry is regfine better for a brand name?
I'd go with RegTidy.com. The reason I prefer it over regfine is because it spells out exactly what it does, which is tidy the registry. Fine is more the end result and does not truly represent what the tool does. It's also more grammatically correct.