I woldn't worry too much about placement of the sensor itself, I've had my sensors within a few inches of the turbine exit for years. Started doing that with my first exhaust set up being APS which provided a second sensor bung about 3" aft of the turbo that first sensor lasted almost 3 years.
I'm up in the air about the lc-1 verses the uego, while I've run an lc-1 now for over 6 years, I did have to replace the controller once, but given the amount of use I have gotten from them I couln't complain. Currently I use the Innovate lc-1 with their combo wideband/turbo timer/volt guage and love it just for simplicities sake. I like a stock looking interior. In the past I had their xd-16 which I also liked. On the other hand, I link about 80% of the cars I've tuned run the uego and they do work great. I think if I had to go with a new set up, I'd go with the aem or the new mtx-l just for simplicities sake and like Ron mentioned, the idea of not having to calibrate just makes life that much easier.