The Atom Series @ 20k or The HTC Touch @ 20k.... seems to be a difficult choice for a lot of people.
If it was I who was making the choice, almost any HTC product would be a clear victor. I've stated this many times over and again, at the risk of repeating myself, I have to say that HTC devices are the preffered PPC's of the greater PPC community. They have unparalled support not only from vendors but most importantly from the PPC community.
The Atom series from O2 is not manufactured by HTC. It is by another company by name Quanta Computers which aren't exactly known for making the best Pocket PC's.
Also, the deal on Indiatimes.com doesn't sit very well with me. Indiatimes.com is more often than not a known fraudster. I've read 1000's of reviews about how products that are delivered are not as advertised and in some cases don't even show up. Ofcourse there are exceptions to that. There is another member here @ TE who recently purchased the same phone (O2 Atom) from Indiatimes and is very happy about it.
I find it puzzling that the model being advertised on Indiatimes.com is available only for 20k while it retails at stores for around 35k. I'm guessing they are only offering a DEALER Warranty.
Something you might want to think about.
Regarding the Artemis... I'm niether sure about availability nor pricing in India although I think you could procure one through the grey market.