Which do you think is the best engine? (Bear in mind that reliability and longevity are a high priority as it's for street use. Mg case only.)

a) 2.2S

b) 2.4S

c) 2.4S high CR

d) 2.5ST short (but with street sized 36/36 ports, and S cams)

e) 2.5ST long (ditto)

f) 2.7RS

g) 2.7RS high CR