you are very lucky! i balloted for qstwn but got no number.

anyway, if you can afford it, i would recommend Dawson>Commonwealth>Ghim Moh
i stay nearby those area and took a walk around 2 areas before i submitted my ballot.
Dawson:
Smaller units @ 83 sqm, but the surrounding is quiet. you are not very far off from food; there's a ntuc nearby at Dawson place and there are kopitiams around SkyTerrace area. (including dental clinic and some other facilities). p.s. the loft units look awesome.
Commonwealth:
max 5 mins to MRT station; that's how near it is. when it rains, you will most likely just get some drops of rain because there is only one tiny road to cross before you reach the estate. very windy in the surrounding area, but not too sure of the actual units. but only left units #04 and below. supermarket (sheng siong) and many food options available nearby.
Ghim Moh; observed thru train rides.
really smacked right between Dover and Buona Vista MRT. unsure about the food options and future facilities. the distance to MRT is quite a bummer.