D16Y8 - 127hp@6600 107ft/lbs@5500 - CR-9.6:1 - SOHC VTEC - OBD2 - from the 1996-2000 Civic EX
the Y8 requires rewiring the engine harness to get to work in your civic.
JDM D15B - 130hp@6800 102ft/lbs@5200 - CR-9.6:1 - SOHC VTEC- OBD1or2 - from the 1991-1999 Civic VTi (EG4)
for the price I'd go with a D16Z6.
D16Z6 - 125hp@6600 106ft/lbs@5200 - CR-9.2:1 SOHC VTEC - OBD1 - from the 1992-1995 Civic EX/Si/Del Sol Si
due to the better after market support and turbo ability for the future.