Looking to buy a small Orange...

I owned a micro terror briefly. It definitely needs a boost to get enough gain for modern metal. No FX loop sucks since you can't add an eq pedal for extra tone shaping. Still though, it's a cool amp and great for the price. If you can save a little more try finding a Dark Terror used. That amp has plenty of gain and is way more brutal.
 
My buddy has the Dark Terror and it's a tiny little cute fucking thing. Pretty much too much gain on tap. The only downside is there is no EQ; but just a "shape" knob or something like that.

A bit fizzy for my tastes, but still sounded pretty boss.
 
If you can spend a little more (or find one used) I'd recommend the Orange OR-15. I use it to practice, with a little Orange 1x12 and I love it!

If you want a little more agressiveness, the Jim Root Terror is tits too! Didn't like the normal Dark Terror though.. Really scratchy and harsh sounding
 
I like the Tiny Terror quite a bit. The Dual Terror is pretty neat as well but honestly, if I was spending more I'd probably rather get the OR-15 as well, even though I haven't even tried one.

As far as the cab goes, the Orange 1x12" with the v30 is very good, although a bit honky.