Don't debate, just do it! I can't think of a single argument for buying a VAG TDI (or TSI, TFSI etc) and not re-mapping it!!! Easier to drive, better throttle response, more flexible, often smoother, sometimes a bit better economy, oh, and maybe even a tad quicker too
May be worth upgrading to GTI brakes which isn't expensive but you don't
need mega brakes for a sensibly driven road car. If you just stick to a stage 1 re-map then brakes and suspension will cope as standard, then just replace as money dictates unless bits wear out on the car anyway and you have an ideal excuse........