I guess it would be best if you defined what "BIG" means to you.

For me a "BIG" 3D Plane is something in the 2.6 meter and above range.

Unfortunately, big, cheap, and good tend to be mutually exclusive.

If you want an incredible, but in my book "small" 3D plane, consider the Addiction-X with the iPas setup....

[link=http://www.precisionaerobatics.com/product_details.php?pid=635]Click here![/link]

That is a 50" plane which will fly incredibly well with lowly 2200mAh 3S LiPo packs.

You get spectacular performance for that price.