I currently have an HP ZR24W as my primary monitor. I also set up my previous Sceptre 24" monitor (TN) next to it for occasional eyefinity use. But, eyefinity isn't great for two monitors because the split in the middle of the viewing area. I can't get another Sceptre unless I get lucky on Ebay. Would I have any problems with using a third (different)monitor, maybe an HP LA2405 or Samsung 2443? I don't notice any refresh differences between the two I have even with the TN and IPS panels.