I'd get a dark blue +4 if t's just the colour.
The 1600 Sigma is a nice little engine - but it is a little engine.
When you intend to use 5th gear you need to tune the engine...

It depends on your priorities, your driving style, your pocket money and other things. Make some test drives to find out what suits you best.

Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life