For that price, you should at least be getting the PA-115s (15 channels and three programs) with a remote thrown in as well. Even then, I think you are paying way too much. I think it will be worth your while to shop around… but maybe that’s the going rate in your area.
As for whether or not the extra $ is worth it… the additional benefit probably does not exceed the additional cost.
Going from PA-105 to PA-110 gives you 10 channels versus 5, as well as an additional program. The extra program only matters if you have a remote because that’s the only way you will be able to switch programs (for example for watching TV, listening to music, etc.).
If your loss is relatively flat, the additional channels will probably not make much of a difference. But if you have a steep slope, then the finer adjustments that the PA-110 (or PA-115 for that matter) will allow, may improve things for you.
I ended up switching from the PA-110 to the PA-115 to allow finer tuning in the highs. Was the extra cost worth it? Hmmm, I haven’t quite decided yet. I’m leaning towards it not being worth it.
Did I notice a difference? Yes…but a relatively marginal improvement. However, considering I will keep these 4 or 5 years…I convinced myself that I would end up regretting it if I didn’t go for the PA-115’s. I’ll decide for sure at the end of the trial.
Good luck, and let us know what you decide.