#1
I'm thinking about getting some FX pedals but there are so many different ones out there I don't know what to get! Anyone got an idea of which would be the best to play songs like Zeppelin, Gun's N Roses, Metallica and Iron Maiden ? I'm thinking of getting:

Phaser
Distortion
Flanger
Wah Wah

That's the main 4 and possibly for the 5th either a chorus, delay or tremolo.

The amp I have has a built in FX board (VOX AD30VT) but I'm getting pretty bored of it now!
#3
Delay (I'd reccommend a Boss DD-3 or DD-6) and a chorus (EHX Small Stone is one of the best out there, IMO)
#4
electro harmonix, fulltone, maxon, keeley, all good brands for the more affordable boss, digitech, beringer, dan electro, and marshall
Gear

Standard Epiphone LP W/Dimarzio Super 2's
1973 Ampeg VT-22

Fulltone Clyde
Ernie Ball VP Jr
Boss tu-2
Boss sd-1
Ehx Little Big Muff
Fulltone Ultimate Octave
Boss eq-7
Ehx Memory Man
Digitech Delay X-series
Ehx Holy Grail
#5
ive got an digi-tech RP-80...it kinda sucks...i mainly play the same as what you seem too, and i do not recommend any of the digi-tech series! ive a friend who has a line-6 FX pedal, its awesome, the change in the amount of detail of flange,disortion,octaving,phaser and wah is great.