One problem is almost all of the turnkey systems out there are about 34 high for the smaller or mini models so for the most part if height is a concern you will have to figure on one of the larger models, 6ft or so, or something like the BC Northern Lights Producer which is about 4FT or so high, but it is 4 and 1/2ft wide and over all seems like a very involved system to get, and it is not the number one stealth box on the block. What sight are you looking at now? Also, you aren't going to find much info on any boards about turn key systems in general. And on the same note, why do you not want to construct your own system?
Adieu