Yes I do like that system better and it will not void the warranty and I will probably own one in a week or two, because you don't have to alter the radio is a plus.
As far as TDR member "miful" is concerned he has already purchased a high dollar option and can not get his money back, so if it can be repaired for a couple of hundred dollars with the extra capability installed in it, it is not that much of a loss. I would think throwing away an expensive system and purchasing another expensive system would not be a good idea. If your referring to the cheap units installed on top of a dash, well you get what you pay for.
The nicer after market types if you don't have a nav system is a good option as well, but it would be better to buy a factory installed system, because of the warranty and would also be included with the extended warranty, that is a big plus with factory systems.