you are keepinmg your car long term.
you dont want to sell it on in 5-10 years time not having known what stg2+ was like.
if after doing 20,000 miles you regret it and feel that you cant use it then just put the car back to stg1 and sell on the hpfp,intercooler,cai,tbe and if you have added anything like lsd, suspension, brakes then they will still be handy at stg 1
my dilemma has been somewhat different to yours - stay at stg 2+ or go Loba but my issue if whether i will be able to keep the Eddie as long as you plan to with family expanding have to look at estate options