Gary,
"Murder One" (Season 1) is stonking! Glad you enjoyed. It's just a shame that you can't watch it over-and-over again, because the "twist" will be well-known to you, if you've already seen it.
As for the "CSI" series, it's one of my fave shows, and I'd say there's almost never a bad episode. In Season 1, look out for an episode which I think is called "Unfriendly Skies". Also check out "Sounds of Silence" later on in Season 1, which is a real emotional episode. Both are truly awesome CSI episodes, but in different ways.
With Season 2, there are several class episodes, but look out for "Slaves Of Las Vegas" (which is actually part 1 of a two-parter, which doesn't get concluded until Season 3's "Lady Heather's Box"!), and "The Finger". Again, both are superb, albeit for very different reasons!
This is one of the few dramas, that is consistently entertaining, innovative, and intelligently written.
I hope you continue to enjoy it!
Oh, and what about the following new ideas?
"CSI: Cornwall" ("There's been a murder...! Anyone up for a pint, then?")
"CSI: Montreal" (all the investigation, is done by the horses!

)
"CSI: Khazakstan"
"CSI: Kabul"
"CSI: Chernobyl"
Pooch