Just my $0.02.....
Unless you have like 7k flying magically out of your a*****e, dont even bother with the K's. (Great motors but HUGE pricetag)
So your realistic choices are h22 and gsr....
GSR is an excellent all around motor for whatever you want to do... NA, Juice, Blown, whatever...
H22 is also a very good motor, however the cylinder side walls are IMO far too thin for a high boost application. Granted you could sleeve them or put in retainers, but thats a lot more money that could be spent elsewhere. If it was me i would go for the GSR. More options, more aftermarket support, and a lot more flexible. But by all means if you can afford it, k20a Type R is...... yummy..... :drools: