Welcome to the forum
I don't know about the other issues, but the sleep 'bug' is a bit of a 10.2.4 thing...
If you search the forum, you will see lots and lots of other 10.2.4 (and 10.2.5) problems...
I have kept all my Macs at 10.2.3, as I have found it the best release on my dual 867 machine in terms of stability. I doubt I'll upgrade until 10.3 hits the streets. (Unless some really compelling features are released in a point release...which I doubt will happen!)
I would suggest a reinstall of OS X back to 10.2.3 and see if the problems still occur... I suspect that they may improve at least a little.
Peace,
Marc