4x2x2 sounds like a 55 US gal to me if i'm not mistaken or a 75?
No it works out to 453 litres, 100 UK gallon or 120 US gallon. Therefore if going for reef will need more than 150w. Someone will be along that is better than me as I have only just started. Big C or Ben will prob be good to point you in right direction, I could give you a list but would not know amounts.
May be good if you could give an idea of what you want Mark whether, Fish Only (FO) Fish Only With Live Rock FOWLR (you would need 50kg Live rock for filtration) or a full blown Reef, which most people even if going for FOWLR will end up wanting. One thing I can tell you about this side Mark is that it is highly addictive.
One thing alot of people will tell you is that you can cut costs by buying some second hand equipment and looking for a tank breakdown for getting Live Rock, not sure about by you but its £13.00 a kilo by me, no way I was paying that it is extortionate.
You will need
Large bin for mixing saltwater
Salt
Hydrometer or refractometer
Test kits
Heater/s
Powerheads
spare heater and powerhead for mixing water.
RO water (in your case would be best to invest in RO unit) due to tank size
Protein Skimmer
Consider a sump / refugium set up (not as daunting as sounds)
Coral sand or fine gravel
Activated carbon
Phosphate remover
Lighting (with 2 ft deep if wanting corals Metal halide)
Live rock 50kg filtration (used aquarium calculator at top of page)
May have forgotten something but as I say many others more experienced, I only have clean up crw at the moment, but my New fire shrimp is amazing, just watched him eat some prawn, brilliant.
Another byline, does this mean Vinnie will be evicted or are you planning an upgrade for him??