i wouldnt hold your breath for a new apple display, they were built pretty future proof and are still better than a lot of newer and current displays out there.
even the good ones still have drawbacks and i wouldnt just pick up a bang for your buck monitor either, they also contain some problems.
for one, that "Hannspree 28inch", which i take it is really the Hanns-G 28" monitor, avoid that like the plague!
Might have a nice price tag, but its not even worth that much.
you can see each backlight lamp on the four sides of the display, and the center is completely dead darker then that outer radius around it, even calibrating it or using a color matching profile in the SysPref does nothing to give it a good quality, uneven backlighting horrible for graphics/gaming/profressional work.
not to mentionsome weird "overscan" issue. like if youre viewing variants of greys, yellows or blue backgrounds (perfect example; dashboard, the greyish overlay you could see interference like diagonal lines) it has noticeable diagonal scan lines on macpros (my new acd 30" does not), so it does not have accurate pixel matching for high end graphics cards.
sorry for that rant but i just returned mine the other day because though it was a nice display it just lacked quality.
id prefer,m hate to say, the Dell 24" or perhaps even this one looks and appears to be not bad and a good price for a 24"
http://www.newegg.com/Product/Product.aspx?Item=N82E16824255001
westinghouse is becoming quite a good display manufacture lately.
if not HP and viewsonic are also good backup options with consumer friendly prices....they have a wide variety of professional grade displays without the premium
here are some 24" displays:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010190020+130982132 8&name=24%22
and some larger displays:
(note: displays over 24-26" do not accurately display resolutions unless its an oddball type...the max resolution for a 24" display will be the same on a 26"-28" display, fyi ~ ie; Hanns-g)
26:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010190020+130982386 7&name=26%22
27:
http://www.newegg.com/Product/Product.aspx?Item=N82E16824001233
28:
http://www.newegg.com/Product/Product.aspx?Item=N82E16824116084
30:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010190020+130982515 1&name=30%22
has a lot of competitive pricing and usually most dsplays by Samsung are a great deal regardless of size.
goodluck! hope that helped!