Petrel 2 is a good computer, one of the best. It is good for tech and cave diving. If you don't need it yet for the dives you are doing and a good regulator set is a more pressing need, why don't you get a cheaper but capable computer like Uwatec Aladin, or Hollis DG03 for instance? For tech/deco diving you will need a backup computer. Then you can get the Petrel and Aladin/Hollis will serve as the backup.
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