Studio light for model and products

[RLPhoto]

I think our mind is set on the Elichrome's. It comes out great in several reviews.
Was wondering tho, how large of softbox is recommended for full body work? The larges softbox the Elichrome store has in the Netherlands is a 50x130 cms (1.6f x 4.26ft). I doubting this will be large enough. Does anyone have any good recommendations on other, larger softboxes?

If you can get the soft box close that size should be all right. I use a 46" and 60" Octobox and it's fantastic. Like I mentioned earlier that the mods is what's most important and expensive... I'd love a deep octo from them btw.