Here's my input on this... I've had both the GReddy and Blitz LM intercoolers. Here's a pic comparison
As you can see, the Blitz core absolutely dwarfs the GReddy one, nearly twice the size, but i can't really see the point of having such a large core on a starlet no matter what power your running. Especially having to remove the crash bar. I think the GReddy core is large enough for all applications. Piping on the Blitz is really long too and the outlet on the turbo pipe to the bov is too small so you get alot of chatter and renders the bov pretty much useless, like running no bov. The GReddy kit also looks alot more better made with bracings on the piping ( Although my bracing have broken off but still ok).
Out of the JDM coolers, I would recommend the GReddy.