I had the .68 (it's the standard that HKS recommend and the only option with the full bolt on kit, the .87 was available as turbo only)
It's very similar to the GTRS in power delivery, but has a lot more up top.
I was also running a greddy RB26 ex cam gear and max gain through a Blitz DSBC spec S to bring it to life as soon as possible
I would DEFINITELY go this route with the evo if I had the cash... but then I would have a 9 anyway
this evo is not going to have $$$ spent on it. bought it stock with HKS single plate, rims, catback and a boost gauge
all i'm doing is dump/front, LICP, 8MR bov, 8MR turbo and 3 port solenoid. all second hand
should see me through to 230ish awkw for just on a grand + tuning