There is a range of engines available, these are the most popular swaps,
B16A2 (various SiR/VTi civics)
B16B @ 185bhp (ek9 civic type-r, JDM)
H22a @ 197bhp (212 JDM) from prelude SiR
B18C4 @ 170bhp (civic MB6 VTI-S)
B18C1 @ 170bhp (acura integra GSR)
B18C5 @ 187bhp (UKDM honda integra type-r)
B18C @ 195bhp (JDM honda integra type-r DC2)
K20A @ 200bhp (212 JDM) honda civic type-r EP3
K20A @ 220bhp ( JDM honda integra DC5)
best performance will be from either the K20 or the B18C (JDM), but they are expensive, all are DOHC VTEC engines. you can pick up a 93 civic stock with the B16A2, but they are jap import only