well if it is a tough notebook you want a construction or job site type environment I recommend getting one of the panasonic tough books:
http://www.panasonic.com/business/toughbook/federal.asp
That laptop could ricochet bullets off of it!
I understand your fear of lack of third party support, and not to sound like an ahole elitist when I say this, but that opinion comes mostly from ignorance. I have a desktop PC at home for gaming, and it runs windows, and I use it to store a lot of my music, etc. I am not a big fan of itunes personally, but I am slowly ajusting to it. It lacks support for the open source lossless audio formats I like to use.
Well, you can run windows on a Mac, so applications and video games aren't even a barrier. Plus, almost every applications (minus video games) has either an open source or Mac alternative that will run in OS X.
Also, believe it or not, but a higher quality system means higher performance in everything, including video games. I bet if we took like BF2 and installed it on a leading PC laptop and on a Macbook Pro in the similar price range the performance would probably be almost equal. High quality motherboards, and high quality engineering make a lot of difference. Also, being a closed platform their developers are able to write software more optimized for their hardware configuration. Also, included in the more expensive package of a mac is built in Blue tooth 2.0, FW 800, isight web cam, back lit keyboard w/ ambient light sensor (adjusts screen brightness too), and built in A/B/G/Pre N wireless standard! If you added all those features to your cheaper PC, it would cost probably more than the Mac Book Pro. The problem is, maybe you don't want those features, and well you can't really take them off. People do not take that into consideration. So, if you didn't want any of those extra features then yeah, I can see you saying the mac is over priced, but I mean the back lit keyboard is freaking sweet, and the fact that my wifi card is A/B/G/Pre-N allows me to connect to any wifi network with the most compatibility. Bluetooth 2.0, didn't use it until I got a cell phone with bluetooth. Now I sync all my contacts and record and make custom ring tones and send them to my phone. If my phone ever died, and I got a new one, I could re-sync all of my contacts right back to my phone. Handy, built in feature of OS X.
Again, I am not an elitist by any means. I own, work with, and support windows I just think that a lot of people say these things about Mac with out even knowing what they are talking about. Thus, giving out and spreading mis-information.
Now, when I look at it, I compare what everything a mac can do out of the box with no additional costs, and then add up all the things the PC can do but with the additional cost of third party software/hardware really why not just get the mac in the first place?
As for desktops go, a Mac Pro is just overkill for me, and I don't like all in one machines, so I will probably always build my own PC for my personal desktops, but when it comes to laptops...Apple is one of the best IMO, and in my experience.