Unlimited Budget! What Seo Tool Would You Buy?

hi guys

i need to buy a tool/software for SEO for my Company which does

- Keyword rank tracking in google
- Keyword research / niche finder
- competition for that keyword (possibly to rank for a keyword)
- nice to have is if it checks for EMD domain availability

WHAT WOULD YOU BUY?
Would like to hear from people with experience with what they suggest as their tool of preference.