If wifi, gps & touch screen not required tz25 is best. Btw tz 30 nowhere to be seen online & tz25 is only on f/k, snapdeal & amazon.
I had read few year back on international sites that in terms of image quality tz 25 is slightly above tz30. Moreover initial firmware of tz30 was buggy for GPS not sure if its solved in updated firmware.
Tz 40 which is said to be best ever tz series camera is also out in India around 22-23k while tz 60 has made its presence in international market.
Last few stock of tz25 remaining as its launched 2yrs back.
Its such a pity that Panasonic are not able to market them well in India, hardly any offline presence except few reputed camera marketplaces.