I work for a managed service provider that currently supports about 90% Windows machines and 10% Macs. We're getting more and more Mac clients and while I am able to support the basics, I'd like to have more intimate knowledge of them. Since it's time for me to get a new laptop, I've been seriously considering making the switch. So most of my questions are for those who use Mac's for supporting Windows based machines (I will be running VMWare with a Windows VM for some company specific applications I need to run). I guess my big question is how hard of a transition is it to go from using a Windows machine to support Windows servers/networks, to using a Mac to do the same thing? We support everything at our company from the demark to the desktop. Secondly, I'm debating which spec to go for. I'd like this machine to last me at least 3-4 years so I'm going with at least the 15", 16gigs of RAM and 512GB hard drive. I'm not sure if I should go with the 2.3ghz model or the 2.6ghz. I don't plan to use the machine for much more then work and probably watching movies while at home. I have a desktop that will be used for any gaming I'd need to do so that wont be a deal breaker for me. Any input will be welcomed.