I don't have any box MODs, but I've read/heard that the Opus D is a great VW MOD (DNA20), and the NES MOD (a MOD made from old school Nintendo controllers) is also rated as awesome (the original was DNA20 and the new ones are DNA30 - that said, you need to get on a waiting list that is pretty long - I just got on the waiting list and the estimated date of completion for mine is 9.8.2014). Hana MODs seem to get glowing reviews as well, though it, just like all DNA-based
If you're not set on a box MOD, you should look in to the Sigelei 20W, a new VW MOD based on a new regulated chip that has been tested and equals the DNA20 in almost every way (flat, straight DC output signal - as opposed to a pulse width modulated signal, etc), though at a much lower price point. It can do .6Ω and higher and is rated from 7-20w. Phil Busardo gave it a glowing review, as did Rip Trippers.