Hi parora.
I can give you some recommendations on what to buy and where to buy. Give me a call anytime on the following mobile nos. + 668 19107138 and +668 47112299. If you have a local sim card, then just dial 0819107138 or 0847112299. You can also sms me and give me the name and details of your hotel so that I can call you.
Last week I was quoted THB 20,500 for the Denon 1911 from the shop called "Future World" which is in Klong Toey around the Bangkok Customs and Port area. The shop no. is 02-2496223. I doubt they would understand and converse in English properly.
In case you are interested in Yamaha or Onkyo, the best place to buy would be "Sangchai-Kaset". This shop is in Ratchayothin area towards the north side of Bangkok. They can actually deliver to your hotel and collect the cash or swipe your credit card on the spot. Here are the models that I was quoted for last weekend:
Yamaha RX-V667 for THB 22,000
Yahama RX-V767 for THB 24,000
Yamaha RX-V1067 for THB 33,500
Onkyo TX-NR609 for THB 22,000
Onkyo TX-NR708 for THB 32,000
I had actually purchased the Yamaha RX-V1067 on Saturday night and returned it to them on Monday due to audible sound coming from the Audio source for which there was no RCA cables connected. Secondly, the system played the sopngs on the USB as a much slower pace which made the sound seem odd. The shop agreed to accept and exchange the Onkyo TX-NR609 and returned the difference in the amount in cash (was pretty impressed with their service attitude - excellent). This shop is by far one of the cheapest that I have found for Yamaha, Onkyo, LG and JVC.
Just be careful in case you decide to buy Yamaha since the whole lot of 1067 and 767 seem to have problems with the mainboards. This Yamaha saleman informed me that several customers were returning their units within a short period of use.
Powerbuy is pretty expensive due to being large retail electronic chain stores (high overheads and admin costs, big profit margins). Their website:
http:www.powerbuy.co.th
Piyanas is another AV store that is expensive. Here is their website:
Piyanas Electrics
I am quite satisfied with the Onkyo after having it for two days now.