It depends whether you want the humbucker to match with the singles in output - then go for a lower output humbucker - or whether you want the split humbucker to match with the singles in output and don't mind the output boost when going to the full humbucker - then go for a medium or high output humbucker. That is however just a basic guideline as you have not told what single coils you are using in this guitar.
Some BKPs I have experience with:
- True Grit bridge: medium output, comparable to a SD Custom 5 but brighter and less low mids
- VH II bridge: hot PAF output, quite bright depending on the guitar. If you found the PG to not have enough grunt, PAF types would not be my first choice.
- Abraxas bridge: medium output, strong midrange
- Rebel Yell bridge: medium output, stronger high midrange
- Crawler bridge: medium output, very warm tone
- Holydiver: medium to high output, some say it is BKP's take on the JB but I don't hear many similarities. The Holydiver has more low than center mids but not to the extent it gets unbalanced. For a bright guitar this could be an excellent choice. The low end is not overly tight.
- Nailbomb: high output, also strong midrange.
To address your specific question on your pre-selection: of those two I would choose the Holydiver for a bright guitar. The output difference is immaterial.
Cheers Stephan