What about 4G63?
Pros:
Massive aftermarket support
Factory internals good for 400wtq
Legendary iron block durability
Great oil pump
hydraulic lifter head that's good for short bursts to 10,000rpm+
Mivec (Evo 9) for a broad power band
Bellhousing adapters available for a variety of transmissions
Cons:
No swap kit, so everything is custom fabricated
Cooling system needs to either be modified or coolant routed from back of head
Not a popular swap, so very little support for "swap problems"
Heavy
Reliability modifications necessary (Balance shaft delete)