i need to know whether its HP desktops or is it Apple iMac that is better when it comes to performance and stability.

The graphics are brilliant on the Mac.. Its just too good.. !

I have HP and i find this the best and good Quality.

definitely i would cast my vote for Apple iMac. the features and the configuration is just awsome.....it has up to 2GB of 800MHz DDR2 memory standard so you can run more applications simultaneously. wat else would you need??? just go for it.

It really depends on what are you are gonna use it for and then decide how much GB you will need.
HP standard has 160GB and 3G hard drive and 1024MB DDR2 memory for faster system response and with greater security, performance and reliability. HP w1907.
Also different computer's have different functions.

This is not the right comparison, HP makes standard PC while iMac has their own way of making and packing. iMac comes everything packed in LCD itself and it makes it expensive. There are option in iMac to get more memory and HDD. Same goes with HP too.
But HP is standard PC and is much cheaper than iMac. iMac is good and you can consider it as luxury of computer. Both of have their own advantages. But if you have plenty of money then go for iMac, you wont regret you decision.

a few more features of the Imac which will probably help you decide - they provide excellent excellent after sales service , the MAC os is crash free and almost free from viruses ,its has a great new display technology (OLED).. and fab battery life !

iMac is a desktop computer. Why you mentioned Battery ?