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High Impact Polystyrene (HIPS) is a great support material for ABS parts as it is very similar to ABS in its properties (read more at Wikipedia), but works with different solvents (Limonene for HIPS vs acetone for ABS). Experiments are ongoing for HIPS as a support material due to Limonene not affecting ABS, and a similar cost (vs double for PVA). HIPS can be easily torn from the ABS leaving an even finish behind. Also, HIPS is soluble in chemical called Limonen, which doesn't affect ABS. It can take between few hours and 2 or 3 days to dissolve the support. If possible, shake it some in a while so the soft support detach from the model.