5 or 6 speed?

I currently have a non turbo Coupe, and to be honest It's got plenty of poke and ability to stick to the tar rivers.
But someone made a Turbo! so I need one, I can't believe how little they are selling for on fleabay? but I never seem to have the money at the time, so I'm going to have to stop looking until I've sold some stuff to fund my desires.
My question is - should I buy the 5 speed or the 6? I'm assuming the final gear is 1:1? on both. so does it warrant the extra dosh for an extra gear?

The six speeders have all the extra goodies too like push button start and silver dials

the gearing between the 2 boxes is virtually the same, the 6th speed has a slightly shorter final drive meaning gears 1 to 5 are slightly lower, 5th for instance on the 5 speed box is 25.2mph per 1000rpm while on the 6 speed box it's about 24.5mph per 1000rpm, 6th gear is about 27.5mph per 1000rpm so it's slightly more relaxed at motorway speeds

having the 6 speed box does make the car more desireable though so if you can find one with that box then go for it

if you want the exact ratio's for each i can dig them up for you, just let me know

Obviously only Plus', 6's and LE's came with the 6 sp box....

Thanks for that, Can't afford the plus or the LE just yet.
I must admit when a plus sells for two grand and a std 20vt sells for £800 (general Ebay) I can't really see the benefit other than provenance? I know there are differences but I can buy them for much less else where.
I can't get my head around the red seats fitted to the LE they look too much even in the red car.
But that's just my opinion.