Depends what you want to do and how much you have to spend on mods.
If only a couple of grand to make it go faster, get the VQ25det.
If you have $5k or so, get the VQ35de as the Z33 single turbo kits will pretty much bolt on if the Stagea is RWD.
I had a similar choice after my NM35 was written off.
a) import a VQ35de Stagea and maybe get some rims or
b) import an VQ25det Stagea and have ~$7-8k to throw at mods
I chose a)