What do you mean by packed? looks more like 6120 is towards smart or business capable phone. Judging by the criteria given, 5610 and w660 is somewhat suitable.

Well I'll give you one good example. PC with built-in 3d accelerator and a separate pci graphic accelerator, which one do you think will perform better? Also if its direct hardware decoding, it should be faster, and your phone should require less processing power on the processor.