Update: Electrician put up the casing, cable and hooked the speakers. Tested and all speakers and sub-woofer are working / emitting sound. Unfortunately, both the front speakers and the rear surround speakers are all mounted at about 7.5 feet instead of the recommended heights (due to room layout constraints).
So, the first sound with the 14 AWG speaker cables is not that great and I am guessing that is because the listener is at a different angle and height while the sweet spot may be somewhere else. I know it sounded much better with the demo cables since the speakers were all set around listener's ear height. But the sound did grow on me later and its a marked improvement over no sound
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A fair comparison of the sound between the demo cables and the 14 AWG cables would require the exact same setup for the speakers. But I can't actually compare since the demo cables were not long enough to set it up at the height where the speakers have been setup currently with the 14 AWG cables. So, good or bad I am stuck with the decision about going for the 14 AWG StackFine OFC speaker cables made in Taiwan.
Now about the other adjustments and connecting the various systems, I will bug you guys with questions soon. For now, I have connected Tata Sky+ STB to Onkyo HT-S3200 AVR and then AVR to Samsung LCD 40LAB530. I did connect my old style Pioneer DVD with the TV earlier but a plastic gear in its loading tray seems to have got out of its groove and it insists on making rattling sound and ejecting the DVDs I put in. So, I need to fix that gear / loading tray issue first before I can attach the DVD Player to the AVR.
Look out for further updates and Thanks once again!