Welcome aboard .
I had my audio running through my head unit for years - saves time to get it up and running. I personally would stick with what you have for now and get the feel for it (just a personal opinion). It doesn't just come straight together and there are a few problems to overcome to get the system to suit its environment, and most importantly you .
The amount of tweaking can be too daunting for some and they end up trying their hand at something else.... I'm sure you'll be fine as you seem to have researched enough looking at the starter kit . (BTW - I want the Logitech keyboard too...)
You're welcome to call around to mine and discuss some of the issues when you're next in Norfolk .