How is the input lag on the 27" model?
The 27" model with the the single DVI-D will have less input lag vs the ones with more input.
This apply to all monitors not just these. This is more important on IPS monitor than TN because ips monitor has a higher response time.
I own the tamakasi catleap 27inch, it too only has a single DVI-D. There is no noticeable lag or ghosting. Older ips monitor a few years ago will have 10ms or worst are poor for gaming due to their ghosting effects. These are rate at 6ms with a single input choice; are fine for gaming.
There are many forum discussion in regards to input lag about these LG ips panel(DELL, apple, Korean...etc)