silver top is Originally for AE101 which is ur model but black top is originally for AE111... so it is up to u... but most ppl will go for black top coz it is a lil more powerful...
check for chopshop find a good engine better than wasting $$$ to just swap only... find the engine then prepare to swap... if u base of ppl to help u to find it is a lil more expensive... a blacktop will cost around 4k (not sure about current market rate)...