I am going to recommend the 3d Connexion space navigator, it retails between Â£40 and Â£100 depending on where you buy it from and which version -PE (personal) and SE (work) but there is no difference in the hardware/software, its just the eula which is different.
Now before you say its for CAD only, the drivers work in photoshop (and others) allowing you to zoom, scoll vertically and horizontally and adjust the brush size. For me personally this works brilliantly when I'm using my intuos 3 graphics tablet as it means I can do 90% of the things I would normally do without moving to the keyboard etc
I second the Harman Kardon sounds sticks - awesome, best Â£110 I ever spent... unfortunately they're dead now.... but they had a good few years... (take to, too many parties! - they got more invites than me)
there's a technical term (which i never remember) which means that there's a constanting high pitched hiss/buzz that comes that only certain ears can hear... Bose has that. but it's not just a small minority, it's a LOT of people. i've had many a complaint about it...
they also just got a 14 year old junkie to come add a looaoaddd of bass to it, there's no massive engineering behind it, it's just bass bass bass.
the only thing you're paying for with bose headphones is the advertising. they pay apple, for example, millions and millions LITERALLY just to put their headphones on the shelves, and out for people to listen to them.
it's kind of subliminal, because about 70% of the people that praise them have never heard the sound quality before, they just see the name a billion times and think they must be good.