LS/Vtec isn't worth the cost and effort to go all motor.
To perfectly honest, Vtec is just one more hurdle to jump during tuning.
Save the money and build the b18b and boost the shit out of it.
Spending you money on sleeving, port/polish and valve train upgrades and you would be MORE the happy.
'94 DB8 and '06 suburban is how I roll
I'd be boosting on the stock bottom end, no more than 10 psi as I also wanna do suspension, brakes, tranny swap as well.
I drive a 95 db8