Methinks you'd just be better off just buying a cheap/second hand monitor plus a series of adapters.

Any kind of capture card is going to add latency to the picture. You may be OK with a Firewire card as they give much better performance than USB (USB is software controlled where as Firewire is hardware controlled) but most laptops don't have Firewire ports. Plus Firewire capture cards tend to be more expensive.