Microsoft Wired Optical Desktop 500 - I have this keyboard! Bought it few months ago... without the mouse. I'm not very happy with it. Seems to be of fairly average quality... finish isnt great and the lettering is kinda faint. However, it has a "tolerable" feel for touch typists. I was expecting a little more from MS... esp. since they price their products higher. Their higher models may be good though. The comfort curve for eg. should be v comfortable...
And all Keyboards and mice ARE NOT the same!!! For eg. I had this iBall multimedia keyboard which was worse than junk. There were times I almost made a projectile of it thru the window! In a nutshell, it had a horrible feel, totally flat keys, bad shape, very bad feel, letters faded off in weeks, and finally it totally died the moment it was out of warranty. I have found a lot of iBall products to be of very low quality... keep far away from this low quality brand.
Have not heard good things about Intex either. I'd just avoid it.
When buying a keyboard one of the most important things is to check for the tactile feel. Also see if the buttons have proper depressions. Check how it feels while typing. Check the resistance of the keys, etc, etc. All this is VERY important if you are a touch typist.
IMHO, perhaps a logitech with the right shape would be the best bet.