My 2012 Charger SXT Plus (with 65K miles on the same drivetrain) has been utterly reliable. The only issue of any sort in 4 years was a wheel speed sensor that failed ($150 at the dealer). Performance is all you could ask for - as you've experienced - but the surprising thing is the economy. My car regularly exceeds the EPA figures - I often average 32+ mpg on long trips, and have averaged the mid-20's in town.
Regarding the UConnect unit- hopefully the car your are looking at has the big screen one, not the smaller screen one in baseline cars. This is considered one of the best units in the industry and should not be "fuzzy" in any way. Your test drive car must have had a defective unit that should be replaced under warranty. Check other Chargers on the lot to compare.
If you have a choice of available cars, the only other recommendation is the 20" wheel option. The upgrades to the suspension amp up the driving enjoyment quotient considerably. I have driven Chargers and 300's with the standard suspension. Nice, but the upgrade really does tranform the car.