Question Compatible GPU's for my system.

PC Tailor

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Any of them really. Any RTX will be compatible.

I've just given you a selection of the more cheaper ones available from maintstream providers:
Video Card: MSI - GeForce RTX 2080 8 GB GAMING X TRIO Video Card ($629.99 @ Newegg)
Total: $629.99

Video Card: MSI - GeForce RTX 2080 8 GB VENTUS Video Card ($609.99 @ Newegg)
Total: $609.99

Video Card: Gigabyte - GeForce RTX 2080 8 GB WINDFORCE Video Card ($666.98 @ Newegg)
Total: $666.98

Video Card: EVGA - GeForce RTX 2080 8 GB Black Video Card ($609.99 @ Newegg)
Total: $609.99

Also, I would say you can probably get better quality PSUs - at the very least, ones with much better warranties for around the same price.
Like Seasonic FOCUS Plus Gold, Corsair RMx or TMx etc.
 

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