You can get it shipped for less than $50:
http://cgi.ebay.com.au/TRANSFORMERS-...item2a07c8ea27
It's up to you. I'm very fond of the Megatron mould, but it was also my first Animated toy and so there might be some sentiment mixed up in my judgement. However, that Optimus Prime is nowhere near as good as the Cybertronian mode deluxe (which is awesome). The DVD is great if you don't already have it.