Headphone Monitoring - what do you think of KRK KNS 8400 + VRM Box?

Due to the location of my computer set-up (in the living room) I am not able to use any monitor speakers 

I have been using some 250ohm Beyerdynmic DT770 Pro headphones, which I am finding a bit bass heavy after playing my mixes on different speakers

What do you guys make of these - the combination of which may give me the next best thing to monitor speakers for around £200ish
 

KRK KNS 8400

http://www.krksys.com/krk-headphones/kns-8400.html 

I LOVE the sound of KRK monitor speakers and the reviews seem to suggest that these headphones give a similar feel

 
I am toying with complimenting them with one of these for £80 – a Focusrite VRM Box to give the feel of speakers and to compare mixes on different "virtual" speakers/environments

[link=http://www.focusrite.com/products/audio_interfaces/vrm_box/]http://www.focusrite.com/...io_interfaces/vrm_box/[/link]


The reviews of both have been extremely favourable and I wondered if anyone here had any experience / opinion of them before I pull the trigger

Although I accept this is nothing like the “real thing” this might make the best of my setup?

Whadayafink?