Personally, I wouldn't get a tent without a full outer rain fly.
The company I've had good experience with for car-camping tents is
Outbound. While I haven't bought something new from them in years for personal use, I have a large 5 or 6 man that I've used for years of family camping and I haven't had any problems with it. Plus we've seen our share of rainy days and some serious storms but we haven't gotten wet yet - without resorting to covering the tent with a tarp.
Another really nice feature I look for when I'm expecting rain is a good sized vestibule. The one on mine provides ample room for taking off shoes, rain clothes, etc. before entering the tent itself.
Looking at the newer Outbound models, their vestibules are even larger than the one I have and, by seeing them in person briefly, some of them even appear to have enough room to set up a couple chairs in the vestibule while still allowing easy access in & out. A couple of examples of 6 man tents from the current Outbound line would be the
Lakeside Long 6 and the
Explorer 6. The one I have is more similar to the current
Klondike 5 in design.
That said, I have little experience with their newer models and am hoping they are the same quality as their older stuff. We recently bought my step son one of their 3 man tents (an
Outpost Long 3) with no ill reports yet, but he's only used it once.