I follow all the newer communities in Irvine, including OH closely, and have closed about a dozen new homes in OH in the past two years. PM me with any questions.
Martin comes highly recommended by many on these boards - so you should seriously consider utilizing his services. Keep in mind that only half a dozen resale homes have closed on the MLS. The rest are just builder listings - lots from Capella and Vista Scena.
Look at these:
Vista Scena - 195 Rodeo
Corte Bella Plan 1 - 103, 132 and 174 Stallion
La Vita - 113 Sunset Cove (a stunner)
Vincenza - 16 Shadybend