Like most things you get what you pay for in regards to paint
Do you want to keep the car? if so I suggest get good materials and do it right the first time and you wont have to touch it for years to come.
If you want to go metallic/pearl you 'll have to use basecoat/clearcoat.......i've used Spies Hecker (good coverage, colour matching etc but pricey) PPG....pricey and average coverage. And Metalux which is reasonable price with good coverage.
If your going basecoat/clearcoat the basecoat quality isnt hugely important in terms of spending heaps but you'll want to get a decent clear with UV protection......better clears have better flow out and vertical hold etc and more importantly if your not painting in a booth its much easier to cut and polish the dust and wont have a memory with the scratches....makes life easier
If your going a solid colour then 2k it up......its essentially just coloured clearcoat and job should be done in 2ish coats depending on colour as opposed to multiple coats of basecoat and either having another gun or cleaning your gun out to apply clear
I was a distributor for a couple years and still have some contacts......if you know what you want I could probably get it at a decent rate