I'd get a T5HO fixture, they're more efficient. Also I wouldn't use the eco-complete, it costs way too much to use in a large tank (IMO at least). ADA aquasoil isn't cheap either, but apparently works great for growing plants because it has lots of nutrients in it; eco complete doesn't.
Mineralized top soil will also provide lots of nutrients for the plants, but is more work to make. Much cheaper though.
Or you can just use regular inert substrate, add some root fertilizer tabs and dose fertilizer to the water column, stuff will grow fine. You don't need to spend $100 on substrate to have a nice planted tank.
Catalina Aquarium fixtures are nice, I have the 3x54W T5HO light on my 75. I was trying to decide between that and a 4x54W fixture, most people said they only used all 4 bulbs for part of the day, so I decided spending extra for light I didn't need wasn't necessary.
the triple bulb fixture is $140, I paid about $178 total, with shipping and the legs (which are $10)
The quadruple bulb fixture is $190, so probably $230 or so total with shipping, if you get the legs.
Nova Extreme T5 fixtures are also nice, I have a smaller one on my 29 and it works well.
A T5 fixture won't provide as many watts, but the reflectors are better and they are more efficient than power compact.