Recommendations for next purchase . . . .

[Highland Ranger]

I have:
- TT GMTIIc
- Stainless and white gold DJII with diamond dial
- Daytona TT with white face

I basically wear the GMTII for casual and switch the DJII and Daytona for business (wear suits).

Looking at purchasing another watch . . . . not two tone.

Stainless possible - like the green sub.

PM possible, like the white gold and blue Sub.

More than one purchase also possible - so if I go PM, then one but if I get the green sub, might also get a stainless grand seiko . . . . stealth, high quality at very good price and love the display back.

Looked at AP, like the white face RO.

Also like the new rose gold and rubber (forgive me) Explorer but not sure it fits in with what I have.

Like the Lange 1 as well but me and leather straps are no go - acidic sweat eats through leather and makes it smell funny pretty quick.

Any other suggestions?