The new i-VTEC K series engine is reached a point where it's become an incredible choice for engine swappers. Honda enthusiasts who are tired of the same old DOHC B series engine, have gone with the engine from the RSX. Six speed transmission and a 2.0 or 2.4 liter displacement is available with intelligent VTEC controls.
Lots of aftermarket support and modifications give you plenty of options. It's still relatively expensive to swap and difficult to source a six speed transmission, but it's a great JDM engine swap to start this countdown.