GZE swap or N/A tuning

[Okami]

Whats up everybody...

Yesterday I went to Ad from groundspeed.nl and talked to him about building in a GZE engine...

The costs are gonna be - 1250 for the 145 bhp engine
OR
1750 for the 165-170 bhp version.
An addition cost around 1500 / 1750 euro's for building it all in.

Now then... I would like to know what would be better to do - either tune the 4age to a certain degree where it has more torque and just a bit more power. (without the ITB option - I dont want to do that).
OR to go for the GZE swap.

(If I wanted to tune the 4age I would go with CatCams - Different exhaust line - 2.0 way diff - and thats about it I think).

Also... I cant do anything myself. I always need somebody to help or to do the whole thing for me.
Also... Is it easy to make an intercooler for the GZE (front mounted).
Please tell me all the pros and cons of this job as I am dead serious to get this ball rolling. Thanks.