Best cordless tool system?

[Ryan K.]

I need an impact driver, circular saw and trimmer (weed whacker).  In the future, I may also get a chainsaw, blower, who knows what else.  The new cordless options look good but it's hard to find non-biased (ie- paid for) reviews.  What I've found, it looks like the top quality and biggest tool selection is Makita, Dewalt and Milwaukee.  It's a huge investment though and I want to stick to 1 brand for compatibility.  I'm also in a relatively remote area.  There's a Lowes and Home Depot, half hour away in opposite directions.  So it'll like be an online purchase.

What do you use?  Where are good deals?  Any Black Friday specials coming up?  These should all be written off as property management expenses, right?