I think any of these are good. Basically you’ll want to decide if you want to go small or go big. If there’s really only two things you want in 500 get the small one. If you know that, realistically, you’re going to expand then get the big one.
For power, the main issues I think of are: does it have enough? and Where is the power transformer?
I started with a BAE 6 slot lunchbox because the power transformer is in an entirely different box away from the unit. Then I expanded to their 19” rack mount which, due to the power being located elsewhere, has 11 slots. (Then I got another BAE lunchbox, then the Cranborne 8 slot ADAT… I guess I have a 500 problem).
The value for lunchboxes is mobility (location recording/mixing), space constraints (no rack), budget constraints (no empty slots begging to be filled).
Resale value of 500 chassis is unlikely to be majorly influenced by the brand name. Go with a brand you trust for service, support, and workmanship.