I had the exact same question about a month ago when I was getting my first HA ever. There are two main points that will help make the decision for you.
Point 1… How much of the cost does your insurance cover? If you have the pay the extra out of pocket then it might not make sense to get more than you need. I was lucky that my insurance covers up to $5k a year, so I got the Smart S IX because it has the top of the line features and processor that will give my one aid the best sound I can currently get. Plus some influence from point 2.
Point 2… What are the chances that you will need an aid for the other ear sometime in the next 3 years? Figure there will be new aids on the market every couple of years, and the normal warranty for the better aids is 3 years. If you might eventually get the benefit of matched aids then it might be worth the extra cash now. If you should never need a second aid, or if the chances are that it will be a longer time before you need a second one, then you can assume you will never get to use those features. If you end up with a second aid in 5 years then chances are you would just get two of them with the latest tech out at that time.
In my case it was $250 out of pocket if I got aids costing $1000 or $5000. Due to some of my hobbies and work environment there is a small chance I will need a second aid, and even just with my insurance coverage I might get a second aid for my good ear set to no amplification just to get all the features for my bad ear. If my insurance only paid 90% so that it was more out of pocket or if they only covered $5000 once ever three years then I probably would have gotten a lower model.
Good luck deciding, and good luck on getting back to hearing life.