Well a lcd with a matte screen is the best option for you in that budget.The EX400 and EX500 are within your budget .
Covering windows with curtains will make a big difference,but in my house i have windows facing East and west.So even with curtains the tvs ambient sensor boosts the backlight to defeat the glare.
You can get a decent tv for 40k if you buy in the grey market,the 40" EX400 i hear is available for as low as 38k in grey market.
You can also squeeze in a samsung 40" C530.
Do note that Sony will soon be replacing the EX400 with CX520 CCFL lcd and the EX520(led-lit) it has a new image processing and more features(usb playback,internet video,perhaps applications like opera browser,control tv with android phones).
The EX500 replacement will be a LED-lit model called EX720 which will be above your budget.
Samsung will also launch new tvs latter perhaps starting from May.