You can convert your engine to VTEC. It's commonly referred to as a mini-me swap. You do it by swapping the head with one from an EX. You would also have to do some wiring and swap the ECU or get a VTEC controller. It's not that hard but it is a little bit of a headache on an automatic.
you could do a head swap. used heads on ebay are like 200 bucks but you might have to get them milled. you can get a professionally rebuilt head with all new seals and pressure tested and a unlimited mileage 1 year warranty for roughly 300 bucks. You would need a ECU and some wiring done but its not hard. I'm fixing to do a head replacement myself.