Have you tried a Mac lately? Since 2005 and the PowerPC Mac Mini I have been amazed at how power management via sleep/wake works on a mac. Even with the bluetooth keyboard and mouse my MacMini would sleep taking only 2 watts of power and it would wake in less than 5 seconds with a fully functional wireless network connection. My 2006 macbook had the same predictable and usable results as well as my 2008 macbook. All of my Mac computers I have put different hard dives and non apple ram and they still work great.
In fact I chuckle each time I see a Windows user shutting down a laptop when at the airport, because with my mac I just close the lid and it goes to sleep and stays sleeping till I take it out and open it up.
No software or drivers have stopped the mac from working right. The Dell windows machines at work may have issues with software or drivers...
"It may be that our role on this planet is not to worship God but to create him." -Arthur C. Clarke