Starting a 20gal

[skabooya]

i just did a quick look at the JBJ viper. It does seem pretty cool but a lot of people dont like it. Aparently the reflector is bad (hammered), some say the light is yellow (but i wouldnt know so whatever), most people have this fixture over 12gal tanks. 24gal tanks have the 150 which makes me think that 70 is not enough light.
Is the ballaset a magnetic or electric. I want a lighting fixture to be as efficient as possible (ie cheap to run).
I wouldnt mind ordering a bunch of stuff from marine depot (its cheaper than other sites, gotta shop around )but because its based in the states would i end up paying duty? Are those the actual prices? I wonder what the prices would be in Canadian dollars.
MH is gonna run HOT! which im not fond of. And topoff is gonna be a pain in the rear. Aparently the clamp is a pain to use as well on these. hmmmm. Now im confused again LOL but not discouraged