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DV capture may well only work over FireWire 400, which is the most common on a Windows laptop anyway, so...that works out.
As you have probably found out finding a laptop with a firewire connector will be very difficult.
I suggest that you contact a specialist PC builder, I do not know where you are but in the UK we have a company called DVC who make systems and supply custom Laptops
I have recently bought a fairly cheap ASUS N56 and that does not have a firewire but works OK for full HD AVCHD files, they do a G750 model which is a gaming machine so a look at its specs may help.
Good luck and do advise the outcome
Several years ago, I would connect a HDV camcorder to my Windows laptop via firewire and use Adobe OnLocation to record the footage directly to disk. (I could also record to the tape simulatenously, as a backup, but capturing to disk prevented having to ingest the tape.)
OnLocation is no more, and it's very difficult to find a laptop with firewire built-in these days. Machines from a specialist builder will probably be pricey.
My camcorder had an HDMI out, so I experimented with a Blackmagic Shuttle (USB 3.0 version) and a laptop with USB 3.0. The Shuttle is very finicky, works only with certain USB controllers, and ultimately did not work for me.
I ended up selling my HDV gear and have switched to DSLRs. Any decently fast laptop with a card reader works! My current laptop is a Surface Pro, and even it can edit decently using a USB 3.0 card reader.
I know this isn't exactly what you were asking about, but thought I would mention because it is an option. Moving to a file-based workflow was a big improvement for me...no more firewire or ingesting tapes!