I am the P&H Rep
For the midwest and would be glad to answer any questions you have about our boats. As for the other boats listed, I have worked for all of the companies in question and I can tell you that you are not making a wrong choice either way you go. I do think that you are looking some very different boats and it might be good to figure out what you will do with the boat most (i.e. Expedition, day paddling, rough water, etc.).
I live to serve! Email me if I can help.
I am not here to sell you anything, just to provide some techincal info as needed.
So, having said all that, here is the rundown;
Andromeda and Sirius are both old-school expedition boats. They both won’t impress anyone on a day paddle but when you load them down they are rock solid in tough sea’s and pretty fast. The slipstream is a better day paddling boat, rough water boat, and small persons boat. Very turny and quick. The Romany (and I don’t know if you are thinking the 16’ or the 18’) is very stable in the rough stuff and easy to edge. Only downside is that if a little slower than the other boats you have mentioned. Good paddling, however, can fix that problem.
As someone else mentioned, paddling the boats first will give you the best information you can gather. Ultimately you know what you are looking for better then anyone else. And, as I said before, all the boats you are looking at are excellent.
Hope I helped!