Your Omega 10% will be fine. The .53 is a great engine, and I much prefer it to my .46FX. The prop you use will depend largely on how you want to fly your Ultrastick. I had been running a 12x5 for most of the past two seasons on mine, but finally broke it this summer. I switched to an APC 11x6 and have been happy with it. I've got the same OS A3 glow plug as I've had in it since I purchased the engine. The #8 is a good plug, but I've found the A3 works just as well in most applications. It's not quite as hot as the #8 (plugs have heat ranges, which isn't a measure of the quality of the plug but rather its operating range). I broke mine in per Irvine's instructions. I've never had to change the low needle from the factory setting.

One word of caution about the Ultrastick--replace the fuel tank that comes with it! I'd read many posts that strongly suggested doing that prior to using mine, but the stock tank looked fine to me. A few months later one of the seems burst, and not only did I have to replace the stock tank but I had to clean up the fuel as well. I'll never trust a H9 tank again.