yes, where is RGF? So much for starting a thread with the words "I want a serious discussion".
As for friedmud, congratulations on your purchase mate, I hope you have great pleasure in this great hobby with your new kit.
However, looking at your reasons, you had better be prepared to switch straight back to Canon again the day their products match your needs better -- which could get expensive. And you have just walked away from the best lens kit in the land -- which can easily affect one's photo IQ.
My advice: if you are unhappy with IQ on the Canon side... try Sony! At least they make their own senors, so their product is fully integrated like Canon. And they have a range of AF Zeiss lenses to appreciate. But be prepared for your hobby investment to start spiralling.
Canon is still the best long term investment in terms of total system value and results, looking beyond the short-term leap-frogging of individual camera releases.
You can easily find parts which are made from different vendors in a device, such as PC, iPhone, or car. Nikon uses some sensors designed by Sony and some designed by themselves but manufactured by Sony. I use both Canon and Nikon, and I would say they have their own strength and weaknesses but they are comparable. However, I can't say Canon is the best long term investment, especially they really raised the price for the new pro bodies and lenses this year, but retailers significantly drop the prices, such 5d3, and sell them on eBay at big discount probably due to overstock or demand/supply issues. We are not married to a brand. Choose the equipment that fits your needs.