Are there big differences between H-IPS A-TW panels (as used in NEC 2690WUXi or new iMac) and older S-IPS (used in HAZRO HZ24W, NEC 2490WUXi or NEC LCD20WGX2)? Anyone had a chance to compare them? Not sure if it's worth waiting for more H-IPS monitors available or just stick with the older panels. What do you think?