I think you should go with the Yak. All the mistakes that were made in the extra(all be it not very many) have been fixed in the Yak, e.g. the elevator half joining system is now much simpler.
And- you can fly the Yak and a 3s pack, thus saving you the $110 as you dont need a BEC or a bigger battery paack etc.
Go for the yak
OR, wait a few more weeks for what Extremeflight are bringing out very soon, there are going to be some very cool planes ariving soon and ive heard that from the UK distributor that one of the new beasts is electric and the same size as the extra!!!