Hi,
Im not expert on this but this is my option, please correct me if I’m wrong
1. I cant comment on the best brand for Toyota allion
2. EBay has good players, but you cant bring down players with GPS (unless hand carry) as it may questioned and quarantined in custom. On the other hand I haven’t seen any sri Lankan GPS map (open map) other than Garmin map. Most of those GPS systems are not compatible with Garmin map, so most probably you can’t use GPS here.
3. The logo’s are just a image put on players ROM, and it doesn’t say it from OEM manufacture. (Even many cheap Chinese brands also have many branded logo embedded). If you need very good audio and video quality better to go for a branded model. Cheap player’s audio and video is Ok. But not superb. On the other hand Chinese players comes with sun and moon (every thing in one box), but some branded players don’t. eg:- Pioneer players doesn’t come with TV tuner. You have to purchase it separately.
4. In terms of reverse camera, most of cameras available in EBay is quite ok. Newest camera comes with built-in distance markings, recently I brought one from EBay for 28.00 USD (no night vision, but give good view even in night)