Wasn't suggesing an Aeron for your use, just a cautionary tale about the Office Depot and Staples chairs. Difference between "good" and "cheap" office chairs is that the "good" stuff seems to last forever--one case where you really do get what you pay for. I've got a couple of Eero Saarinen chairs from Knoll that are nearly as old as I am and still look practically new. Got 'em for about 50 bucks a shot--one of the best ebay deals I've ever gotten.
Want a comfortable chair to sit back and relax in, try an Ekornes Stressless Chair.
As far as alignment of the display goes, yeah, you'll get a crick in your neck if it's off-center more than just a little--been there, done that.
One of the OSHA recommendations is that the top of the monitor be at or just below eye level--this is a good one if you are sitting upright in an office chair--if you're in a recliner I suspect you want it positioned so that you can look at it with your neck reasonably straight--this might mean having it fairly high.