perhaps maybe late summer (end of august) to early fall prices will drop. time is money - think of the time you'll wait for the price to drop. That's time that could instead be spent enjoying your ST50 earlier on in the 2012 model cycle (now being about the third month of the ST50's availability) Buying it closer to the end of the year to get to your target price will be buying it closer to inevitable announcement/availability of the ST60, which will outperform the 50-series models.
If Amazon is your retailer of choice, then they're offering the ST50 for $1,188 right now. Panasonic sets coming with free glasses happens, but not often. My best suggestion would be to pick up two pairs of the Samsung SSG-4100 glasses, which are $19/ea on Amazon right now and fully compatible with the ST50, save for being more uncomfortable compared to Panasonic's 2012 glasses. You'll be about $120 over your target price, but IMO it's a drop in the bucket compared to the enjoyment of roughly ~3-4 extra months of viewing a new 2012 model rather than waiting for the perfect price.
ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Sony KDL-32W650A, Sony BDP-S1000ES, Marantz PM8004, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT, Sennheiser HD598
lr Panasonic 50" ST60, Sony BDP-S5100, Apple TV
pc Energy CB-5, Audioengine D1, FiiO A1