Well, the Polar View charts will take a NMEA AIS signal in. You might look that route as it is very inexpensive at $49.99 for the chart software license.
We were quite budget minded when getting AIS on our boat. We decided on getting the Standard Horizon GX2100 VHF radio (Here
) which has an AIS receiver built into it. It actually does a great job with a tiny display on the radio which you can customize with your desired alarm distances, etc. The radio itself including AIS was less expensive than a good antenna splitter required for the AIS engine we were considering purchase of. With no splitter required since it is built into the radio--we thought that was win-win. Since we needed a new marine VHF radio, we felt we couldn't go wrong--and we were right. Also--that one has an accessory remote "smart mike" which you can buy which gives you the ability to see the entire AIS target scene on the mike--of course it is an even smaller screen but it is very functional outside in the cockpit should you install the radio inside as we did. The radio puts out the standard AIS signal for export to an existing chart plotter or a computer as well.
However, already having your AIS engine--it seems you're in search of experience which I really don't have. I will keep my fingers crossed that someone happens along with the answers for you.