My 2c, maak daarmee wat jy wil
You are going to want to upgrade somewhere in the future.. 99% of people do. I would rather spend a little more now and have a setup that can be upgraded somewhat.
For lighting, look at GrowOpz, he has decent affordable options. If those line items in your quote is ex VAT (too lazy to add them up) and I suspect they are then the price of that light is actually R2500.. for R3000 you could get two 75w lights from him, giving you more light and flexibility as well as the ability to save on electricity when plants are small. Plus, if one fails you atleast have something to tie you over till the warranty is sorted.
When it comes to extractor fans, that one will probably do but I prefer running a larger fan at slower speeds.. 150mm minimum.. much better on the noise level and puts you in position to easily upgrade or turn up extraction when needed (especially during late flower). I think theire is a website like fans.co.za or something that does not add the mark-up that grow shops do.
Lastly, 80 x 80 is super small. Something bigger would offer so much more flexibility. In an 80 x 80 one or two plants max.
I know that all of the above is going to push up costs.. but in the long run you will not regret it. A slightly larger investment now will save you money down the line.
And as Martin7381 said, see what you can find in the 2nd hand market.. people often sell tents and other gear for dirt cheap. If you are patient you will be rewarded. Just be careful of buying lights in the 2nd hand market. You have no idea how hard they were driven and generally will not enjoy a warranty.