That Behringer HA400 is more of a headphone distribution amp for powering 4 sets of headphones from one headphone output. The MA400 is a better choice, although you'll a DI to feed into the XLR input. It can mix an ipod or any line source in with your bass signal too. The Vox one is not bad for the money, but is cheap and plasticky and pretty hissy. I have both of these, but I would go for the [sfx] H1 if I was to start again.
EDIT: That Ogre looks pretty good to, never seen that one before:
[url="http://www.playawayguitars.com/play_away_guitars_shop.php?itemID=520"]http://www.playawayguitars.com/play_away_g....php?itemID=520[/url]
Maybe Dave would knock something up though, I'm sure it would be great quality and resonably priced too.