I'm currently thinking of upgrading my camera equipment soon. The options I am thinking of:

1. Upgrading my Zuiko 14-45 f3.5-5.6 lens to the Zuiko 14-54 f2.8-3.5 lens. The 14-54 can be bought second-hand for around 550-600 SGD. Not sure how much I could sell the 14-45 for, maybe 100SGD.
   
2. Getting the Sigma 30mm f1.4 lens. Would be a wonderful addition to my Zuiko 50mm f2.0 macro lens, for low light situations. Second-hand would probably be around 500 SGD, however this lens is not being sold very often.
   
3. Upgrading my E-500 body to the E-3. Second-hand around 1700 SGD, if I buy a new one (comes with the battery grip), I could try to get a 1,990 SGD promotion.
   
4. Getting a flash. Probably the FL-50R, sold for 400-500 SGD, I think.

Options 1 & 3 are the most likely, sometimes there are second-hand bundles that sell both. The question is, however, if I want to spend that much money at the moment.