Just picked up a 1980s vintage S&W 686 with a 6" barrel.... well, actually I get it in another 5 days as California holds it hostage for 10 days first. I think that I would like to mount one of those holographic red dot sights on it but have absolutely no idea what to look for other than I don't particularly want one of the ones resembling a telescopic sight. Have been looking mostly on eBay but am not impressed with what I see... I would like to stay under $100 on this but still have something that will stand up to full throttle 38 Spl. Any suggestions? Thanks.