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An image acquisition laptop really doesn't need high specs at all. I use a 6 or 7 year old i7 and it is way more than needed. Any modern laptop, even the new celerons, will do the job. And if you are doing your processing on a separate pc you don't even need that much storage - as you move the exposures off for processing you can always delete the old ones if space becomes an issue.
My system:
2015/16 HP i7, 8gb RAM, 1TB SSD (upgrade from original 512gb hdd)
The system only has a single USB3 port so everything is connected through an external, self-powered USB3 hub - 2 x cameras, polemaster, mount, focuser, gps dongle & guide cam dew heater. All runs with plenty of headroom.
So don't be too concerned with the processor power, any i3 or better from the last few years will work, I would look to 8bg ram and 512gb or larger SSD/M2 storage, along with as many native USB3 ports as possible or a quality powered USB3 hub (I use a Startech 7 port 12v-48v industrial hub).
Cheers,
Mark
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