All I can say is my brother has the Helix 9. It works like your 997 and my 998c except it is easier and better quality. You will love the picture you'll see if you get one. Check to see if it is Gen 3 before you buy. Yes, 10 inch screen would be better. Bigger the screen is always better to see what's down there. I'm like you and waiting for a deal to come along. Digital Oasis / Hodges might be better than Cabela's I know Dig Oasis had a HDS 12 I would like to have but I didn't have the jack$$ to get it at that time. Also, check with Lake Wylie boats and sales on Hwy 49. Vic may can get you hooked up with a better deal. Good luck choosing.