Options should be checked are
1,HD ready or full HD
2,internet support
3,adaptor for WiFi built in or separate USB dongle
For tv with no built in WiFi adaptor....It's better option to connect an internet tv to network with a bridge as WiFi receiver which cost only 1500.(bridge can be connected to lan port of tv,eg. Dlink dap 1155 bridge/access point)
Where as for USB dongle which costs 2800-3000 Rs.