BBG Marine has the HDS 7 gen 2 combo (Structure Scan included) with Insight mapping for $1350. Brian is a great guy do deal with, I highly recommend him no matter what brand you buy.

I would buy the biggest screen I could afford. My first HDS was a 5 and I can tell you it's hard to make out the details of side scan on that small screen. The 7 is way better and I really like my 8. That being said, when I find the right deal I will have a Gen 2 HDS 10 in place of one of my 8s.

Don't get caught up in the brand pi$$ing match, buy what you like and works best for your $$. There are good people on here that will help you with either.