Pro's for Lowrance, imo
1. Much better 2d image
2. More elaberate/customizable set-up
3. better mapping/gps
4. better downscan
Cons of lowrance
1. Set-up can be more complex and confusing for some
2. Will no longer accept lakemaster cards(since hummingbird bought them out)
????
3. older HDS do not have interanal SI/DI need external box(lss-1/2)
Pros for HB
1. less elaborate set-up, easier for some to get going
2. si in shallower water casts image farther(not that you can tell what anything is in 2' of water on si LOL
Cons
1. Less customizable, fewer options
2. horrid 2d
less hot keys, takes more "menu" pushes to get to settings
In your budget i'd find a used hds 5( i would look real hard for a 7 at a good deal actually but the 5 is good too), and later get a used lss-1 module down the road if you desire it.
Just a real quick dirty list on things that have stood out to me over the years.
2 of my fishing partners HAD hummingbird si/di combo graphs on their boats(798/998 hd's) and BOTH of them switched to lowrance after fishing with me a bunch.
I used to hate fishing out of their boats and having to hit 1000 menu keys to manipulate the screens the way we needed.
But many people do prefer birds, it's like chevy vs ford both are good, just depends on what you want to get out of your units.