Year’s back I spent the summer and fall running all over the West.  When I returned home and caught my breath I started researching gps units on the net.  It was not long and I heard my wife rummaging in a back closet.  In a few minutes she handed me a new in box gps.
As she handed it to me she said she did not know what unit I want, and I could return it if wanted.  I really appreciated her insight into my wants, and that she was okay with me exchanging the gps.  I did exchange it for a unit that cost more, and it was a good investment.  I am a strong believer that in most cases a more expensive gps is a good investment.  But the technology is rapidly changing and your new unit will be obsolete in a short time.
From looking at the information the 200w is a good introductory unit.  
A key is that all the units you are looking at have the high sensitivity receiver.  My son has an early Tom-Tom that works great in most areas, but in cement canyon it fails to receive.  The grandson barrowed it for a trip to San Francisco, and it was useless.  Tom-Tom now has some units with high sensitivity receiver. 
It appears you have done a lot of research, but if you have not used it try the Gamin page, which allows you to compare their units. 
https://buy.garmin.com/shop/shop.do?cID=134I can understand looking for a deal, I am always looking for a deal.  I also suggest that you check the Garmin rebate page every once and while.  I have saved some bucks between a good deal and a Garmin rebate.  I suspect we will see more rebates in the spring.  
http://www8.garmin.com/whatsNew/currentpromotions/