I am a novice when it comes to hardware world. If this is not the appropriate site, I request the moderators to redirect me to the correct one and close this question
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My objectives pertaining to the laptop:

My objectives pertaining to the laptop:
Configuration to suit development needs:
16-32 GB RAM
1+TB SSD
i7/AMD equivalent
Motherboard that can handle all the above
Possibility to add RAM, in the future
Only ONE os - RHEL(enterprise or developer, I haven't decided). Dell laptops come loaded with Ubuntu and are 'RHEL certified'. I didn't understand what they meant, also, I want only RHEL, to begin with.
What would save a 'considerable' amount - buying from the provider with above features preconfigured or simply buy the hardware without OS(bare metal) and then install RHEL by myself? If there isn't much difference, I would prefer to buy from the provider.