There are different and newer features on these latest model MacBook Pro series
that may be worth considering before purchasing one of them. The new Touch Bar
and Touch ID gets rid of the top row of keys (programmable in older model) and
the new model has USB-C 'Thunderbolt' spec ports and will not have MagSafe DC
power adapters. So these have been an issue with those users who do not wish to
have to adapt their old peripherals, or buy new ones, to use the USB-C Thunderbolt
3.1+ connections. Also some issue had been reported with certain display adapters.
https://www.apple.com/macbook-pro/
Look at the purchase of this hardware from a practical and functional point of view
and not just any wow-factor that unit may generate from peers who may want one.
An older model that still has standard USB ports may still be available in online store.
But I didn't see one in new 15-in specs https://www.apple.com/macbook-pro/specs/
Or consider their 'Refurbished and Clearance' selection direct from Apple store online.
Where available, the 'Refurbished MacBook Pro - Apple Certified' section may do nicely.
Not all USB-C ports & accessories are created equal nor intended for equal usefulness.
The data speed and information types vary depending on original purpose of connectors.
You could also look to older 2015 model still in online store page at apple.com for details:
13-inch and 15-inch MacBook Pro (2015) View Tech Specs
These still offer conventional USB ports and Thunderbolt ports.
In either event, the new models require you to advance purchase the upgrade level you'd
prefer, because they're not directly upgradable by the end user. While some may be able
to later on have the solid-state storage upgraded by an AASP, that may be untimely.
To see end-user upgrade in SSD/pci-e or other a model may sustain, you could look into
owc macsales and check into upgrade by model, or by product. If available, they'd list it.
The Apple Store online custom-order section possibilities are viewable in Buy Now section.
In any event...
Good luck & happy computing! 🙂