First up, the speaker rings you have are pretty good and do the job they are meant to do. No need to get anything branded. I had the same rings initially in my Nissan build and only switched to the stinger kit cuz it was a 3 layer setup. The 3m backing adhesive is really good on these. Just make sure when you are sticking the outer ring, place it around the speaker edge and not over the speaker itself. This way, the speaker is serviceable
The x5550bt has been researved by another member now. If the sale doesn't go through, you may buy it. The asking price was 35k. I also had the rainbow ipaul amps for sale, great sq amps but they are a bit pricey. Please check my sale thread. All info is available
And lastly, since you are in islamabad, I'd suggest you get in touch with Shehryar @ soundvalley in pindi saddar. He has some good equipment and can arrange also some good branded wiring. You may also ask haroon radio in karachi