Almost finished the whole itinerary, by booking online at united.com, I was able to get a ex-YVR departure with one night in SFO for only an additional $100 USD. Woo-hoo! The SFO-SIN is on a 747 via HKG and on the return I'm on 777s via NRT right back to SEA and then a short B1900D flight with UX back to YVR. Net Q-miles: 18,215 and with 100% bonus, grand total: 36,430.
The expensive part? The Y award on SIN-DPS is 35K miles for a 2 hr flight.