I have owned and used the Lowrance Link 9 VHF, AIS DSC ($679). Great price, good unit and has a small monochrome display on front. Easy to use once you get used to it although when I set AIS alarms it would send me totally bonkers with constant AIS alarms. Probably more to do with my settings but it was such an issue I turned the alarms off except for night sailing. When an alarm would sound, I'd have to leave the helm and go below to cancel the alarm and see what the issue was.
I have also recently purchased the Raymarine Ray 73, VHF DSC AIS unit ($1200-$1300) which is integrated into my Raymarine network. Although it does have a display, the display doesn't show AIS targets or information (or maybe it does and I haven't looked deep enough into it to switch it on). It does however throw the AIS target data overlayed on my Element 9 Chartplotter. It's much easier to use and see what's going on right at the helm station. Problem is I now need a 2nd mic station at the helm as new boat is much larger and further to go below to answer radio. (Handheld at helm suffices for now).
Both are good units. I think Raymarine is a bit better and more intuitive when networked to Chartplotter but is also more expensive. Both can be networked. I went with Raymarine on the new boat as I already had a full Raymarine instrument setup and network.
At almost half the price, the Lowrance is excellent value.
Darren