Just starting out, so asking if I should continue to chalk things up in my QF or switch to other OW.

(1) home airport - SGP
(2) miles flown each year & in what class? 52k all chalked on Qantas from Jul(start point)-Dec 11. Estimating this year will be 52-80k? Economy
(3) types of fares bought - either a discount economy or economy
(4) choice of airlines/cabins. work and/or pleasure? - work basically whatever is cheapest or reasonably cheap.
(5) routes flown most often - SIN-SYD (2X a year), SIN-LHR (2X), SIN-MIA(1X). Sin-MNL(3X). SIN-PVG(2X a year)
(6) current FFP status - QF Silver. BA lowest (LHR-EDI). United (not sure expiring. First flight may09. silver). AA (1000 miles)
(7) What is most important to you in a FFP? -redemption, upgrade, lounge access
(8) Preferred Airlines - none. SIN-MNL-Sin will be on SQ

Please advise- Going to embark on SIN-LHR-SIN again(CX flights out, BA in)