i don't know much about tannoy reveals, so not going to be much help there.

In general though, monitors are the most important thing in your studio. So spend as much as you can bear, you can get plugins galore for free from elsewhere, and you can buy processing power in accordance with your needs.

500 should get you some cracking 2nd hand kit.
Mackie 842s go for around that 2nd hand, or there's plenty of other top notch options, Adam a7s, the magic room compensating JBLs etc

So go for monitors, thats my advice.