extra 50 can get 19'' rather 17'', why not?

But nowadays most of the LCD is TN panel due to cost wise. TN panel is cheaper which make it more easy to sell and faster response time make people feel better(psycological). That's why most computer shops stock TN panel rather than other.

I like S-IPS panel due to much better viewing angle but it is more expensive which make it not favourable for shop to sell.

You set the wrong resolution, 1280x1024 is the ntive resolution for 19inch non-widescreen one. Sure become blur blur a bit, lcd is best display on its native resolution, others than that definitely become a bit blurish.

It is a TN panel

The 971 model is S-PVA which has good viewing angle

The 931 model is a bit rare. Whether it obsolete or not, it won't do any different, the most important is whether you are satisfied with its picture quality and its spec or not and can last as long as it could.

The Benq model looks impressive on paper and cheaper than others but in real term, I don't know much about Benq. But a lot of people had bad experience with its brand, but it is last time out, don't know how is the current quality is.

As far as I know, only Sony offers zero dead pixel. Others like Samsung, LG, Dell, Viewsonic etc are at around 3-7 dead pixels. Nowadays, dead pixel problem is not as severe as last time, (when first bought) although occasionally still got, not many as last time, may be the technology is more mature now, but you can't complain much if dead pixel come out after several years of using.

I am sure about the 7 working day, but a handful of shop can give next day 1-1 exchange if found dead pixel or defects, so better fast checking after brought home.

Ultrasharp is just mean got DVI input, that's all, it is just some marketing term to make it sounds good.
DVI and VGA input got slightly different, DVI is slightly more sharper than VGA due to digital input but for ordinary users whom are not selective, some even can't distinguish between both if I put one VGA and one DVI side by side.

I am not saying it is not worth or worth, I just said 'ultrasharp' is just a marketing term, a good marketing term

If I am a seller of Lcd, I said to you 'A' lcd is 'ultrasharp' while B has DVI input, which one you choose?

Lcd needs to set on its native resolution, others than that surely not as sharp.

What is your resolution setting.

And LCD is not recommend to use ClearType (as internet explorer offer one) since it distorts page setting mean that not real native resolution.

Just found out, surely blur then.

1024x768 is for 15" LCD

1280x1024 is for 17" and 19"

TN panel viewing angle is less than PVA or MVA panel for sure.
But nowadays, majority TN panel has 160/160 angle already while PVA/MVA or S-IPS panel has 178 (if not mistaken, correct me if I am wrong).
It depends on your preference and usage.