If you buy from Racers In Exile I am sure Stuart would (with your permission of course) open the box and check the software level, update as requested.
All you need to be FULLY adjustable is the ESC @ £90 and the LCD program box / PC interface @ £20 (which obviously you will only have to buy one of no matter how many ESCs you have).
The LCD program box lets you access all features, allows you to access 3 stored profiles (so you can change from a super punch dry set up to a super smooth wet set up in just 3 button pushes) and gives you all the descriptions so you don't have to remember what option 21 actually does!
I have run 60A ESCs in 2wd with 6.5 motors. Lasted a year until the big jumps at Ardent upset the Speed Passion motor and one phase went high resistance and killed the ESC.
I'd say there was enough safety margin to run with a 7.5 without fear at all. Obviously that is without using TURBO features at all, if you want to do that I'd keep it to 8.5 or more!
These days I just run the 120A ESC in all buggies and the Xtreme Stock in TC, both run 100% perfectly and stay super cool too.
As for the colours I deliberately went for the black ones as I think they look cleaner and smarter than the blue. I've never really been a fan of the blue that is common in RC, much prefer a classy looking black / gun-metal finish personally ... we are all different though!
(Think how cool the black will look in an FS2-SP with all that dark anodising mate
)