I'd like to hear which brands produce good monitors,and which brands are to be avoided.
For example,Acer and Asus are very good brands but I don't know about their monitors that much.Would you recommend the monitors produced by those brands?
I agree. I've used/still have Dells, Samsungs, and Acers. All have been reliable and have had no issues since I've had them (I've given some to family members for temp. use when I've upgraded). Out of the three though, the Dells have maintained their image quality the longest, at least from what I can tell. Check out the Dell outlet center if you are on a bit of a budget.
For budget I recommend Asus, BenQ, Samsung, LG, Viewsonic
For good IPS and VA monitors I recommend Dell, HP
For premium / professional IPS and VA monitors I recommend NEC, LaCie, and Eizo. Hazro is good too, but not sold in the US to the best of my knowledge.
I would have recommend Planar in the past, but unfortunately they are no longer producing monitors with IPS panels. All their monitors now use crappy TN panels. Looks like I will never buy another Planar monitor again.
In general, I've had excellent luck with dell for everything from midrange to high end. I haven't tried their low end much, but I have owned a number of Dell's ultrasharp panels including (but not limited to) their excellent 2408WFP and U3011 (my current monitor-of-choice). I've heard good things about HP as well, though I've never owned any of their monitors.