Have money, go for 24". If not, 22" is ok. 22" for RM6++ is a value for money.

Not all place can get RM5++ lor and E2200HD price in RM6++ range.

Last month, Benq already introduced their HD series which offered 1080p resolution for 22" and 24". Check their website for more details.
M/E/T2200HD.

I think Samsung misguide us. I also wonder why they put full HD 1080p but after I checked in their brochure (Download Brochure), Full HD 1080p only applicable for T220HD. This model has embedded DTV tuner and speaker.

After a few weeks using 22", I think anything bigger than 1680 X 1050 will give smaller images.

When doing my graphic work, previously, I always work in Actual Size to see the exact image size on screen.

Because common monitor screen size still use 1024 X 768 resolution, most of my images work are less than that. Specially for small bar and button which have less than 50 X 50 size, even in 1680 X 1050 resolution the images are small.

So, from this experience, although I never have the opportunity to see HD monitor with my own eyes, I believe it will produce smaller images when in Actual Size view. But I believe other than that, HD is good for movies and games.