I'm really confused on what filter would be best? Because its such a large volume of water and because I will be planting it.
For that volume of water, a sump is the best option. This is way out of consumer filter range and a custom filter that big costs a fortune and a half.
Now for cycling again because my minds set on planting it, the information given here suggests not to do fishless cycling when wanting to plant the tank...
I really do need to have a look at exactly what is says.. but I am of the opinion that a fish-less cycled aquarium can be planted without a problem and I very much encourage it.
On the other hand, I also think that fish-less cycling an aquarium that large is futile. What size fish were you thinking of? If small fish and shrimp, then you are better off just planting and adding say.. 10-30 1" fish per week. They will produce so little ammonia that you it will never register on the tests. In effect, you will be silent cycling.
Also with lighting regarding plants, I am planning on using 5.0 UV tubes so I'm unsure how this will effect the aquatic plants?
Will the aquatic plants need their own lighting?
You will probably need a metal halide over that, to give it enough light but I don't know how that will affect the rest of the animals.. or go for low-light plants and use some spotlights which are aimed only at the water.
I can't help on the cycling question other than to observe that "silent" cycling is normally advised as being for non beginners but I don't know why.
Because there is a high risk if the plants die. A prerequisite for silent cycling is being able to keep aquatic plants alive. Also, the risk is higher, the smaller the aquarium, which is what beginners often have.
In terms of heating the water I would put a (or some) heaters in line with the pump if pumps. These will have themostates so will only heat the water if the land doesn't do the job...
A couple of heaters in the sump should work.