Am I missing something about this dell monitor?

OK well time for to finally upgrade from crt yah! I was looking at dell.com and they had a 19 inch widescreen for $109http://accessories.us.dell.com/sna/products/Displays/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=320-7459

Then my friend offered to sell me his 17 inch standard dell monitorfor $90 which is like in perfect condition. I went and looked up the specs. http://accessories.us.dell.com/sna/products/Displays/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=1708SB3

Now, am I missing something because I'm very confused to as why a 17 inch is $190 while a 19 inch is $109. It seems the 19 inch has a better contrast ratio etc.. Should I buy from the friend or buy from dell the 19 inch. P:S: I kinda want the montor to stay as small as possible to keep my graphics card running sims 3 at max, basically I'm concerned about picture quality not at all of the size of the monitor. Thanks! :)

My computer specs:

CPU-AMD Athlon x2 4200+ @ 2.20 ghz

GPU- Evga 8600 gt

Ram- 3g of ddr2 ram

Windows vista home premium 32 bit

There is only one monitor manufacturer worth touching. Samsung. Also don't bother with anything less than a 22" widescreen, and even that is a tad too small.WDT-BlackKat

The UltraSharp is Dell's old 2005ish monitors. I had one and it was great...until it started blacking out for some reason, never could figure it out. I just guessed some bad soldering or the display chip inside died. The other one is newer and probably will look better. The Ultrasharp was a kickass series back then, really great picture, but the one you are looking at is a newer model and widescreen, and widescreen = good.

EDIT: The prices, I have no clue why, but just go with the 19in widescreen one. I think the difference in the prices is cause of the 3yr warrenty on the 17in. while the 19in isn't including one in the price.

The UltraSharp is Dell's old 2005ish monitors. I had one and it was great...until it started blacking out for some reason, never could figure it out. I just guessed some bad soldering or the display chip inside died. The other one is newer and probably will look better. The Ultrasharp was a kickass series back then, really great picture, but the one you are looking at is a newer model and widescreen, and widescreen = good.

EDIT: The prices, I have no clue why, but just go with the 19in widescreen one. I think the difference in the prices is cause of the 3yr warrenty on the 17in. why the 19in isn't including one in the price.