Thanks for the info Robman, though i'm still not sure how similar the 6131 and 6131n really are, mostly because of their physical differences and their different code sheets:

[Link: ofausa.com]
[Link: ofausa.com]

But then again, i don't know much about them either. Btw, The URC-3220 doesn't appear to be compatible with the coolsat 5000(?) can't get it to work for the life of me anyway. Don't really like the look of the 6131 so i'll probably end up getting something else. The 6131n would be nice but i'm hoping for definite confirmation (?)