Hi Gaz,
Welcome to the GTI fold - I'm running a 2014 GTI PP Manual and have lowered mine on Eibach Sportlines which give a reasonable drop and keep a reasonable amount of the comfort (even on the 19" wheels I'm on now). I've had mine on for around 2 years now on Standard shocks with no issues.
As for a remap, whatever you go for, make sure it's a "low torque" map. The clutch on the manuals is very marginal and there have been quite a few reported cases of it slipping at stage 1. Mine did when I fitted a tuning box (that said, I'd still recommend the tuning box - DTUK). I'd say to get the feeling of speed go for the pedal box as advised above. Alternatively factor in for a replacement uprated clutch at around £600 plus fitting as a GTI PP at stage one is a very rapid, enjoyable and easy drive.
Hi mate,
How much do the Sportlines lower the car by? I don't want to go too low as there are some fairly nasty speed bumps near where my daughter lives so I don't want to end removing my bumper every time I go over them!

Same goes for the ride quality too, I don't want to make it too harsh a ride as my daughter is in the car quite often (she's only 2) and she's happier in the Golf than the Focus so far so don't want to make it worse.
Someone did say to me that the clutches are a bit poo and that I should have gone the DSG route but I test drive a DSG GTI and didn't really like it compared to a manual one plus I really hate the fart noises they make! I've seen the uprated clutches so if I go for a remap, I'll put a clutch in before the remap, won't take long to do

I'd rather do the clutch as I know I'll regret not going for the proper remap! Lol!
Are there any particular remaps/tuners to go for/to or avoid in people's experience?