I still say what I said before, and that is the 2970DXN2. I say this because of the commant you made about others besides yourself using the radio. Id you go with a 2950DX and the amp, you are going to have to show your wife how to deal with adjusting drive levels wit hthe amp on or off, hoping that she can turn the amp on, remember to turn it off when needed, overdrive, etc. So I would recommend against the idea of the 2950DX and the amp.
If you have your ham ticket, and she does as well, then sure, so with a small HF rig or one with 2 meters built in as well like an Icom 706MKIIG. Even if you guys don't, you guys could for all intensive purposes install 11 meter antenna for the CB/freeband and use that, but ALSO install a 2 meter antenna cut for MURS, get a small 2 meter cheap radio eventually for the house and set up an antenna for it, modify the radio for MURS as well, and use VHF from the house to the car to keep in touch on FM. Better range vs. 11 meters, more quiet, and easier for her to use.
If the idea of the HF rig scares you, or more in particular, your wife, do what I did years ago before my woman got her license. Just program all settings and power levels, mic settings, frequencies, etc into the memory channels, put it in memory mode for her, and just refer to the settings as "channel 1", "channel 2", etc. So you see, even with an HF rig in the mobile, you can still make it simple for someone who is just learning radio or not too familiar with the operation.
If the idea of that doesn't appeal to you, or is a bit over budget, just get the all in one, no frills, 2970DXN2. They *just work*. Just do the conversion, leave the internal settings alone, unless you get someone who really knows what they are doing, and leave it. It even has the memory functions as well that you can teach her or refer to frequencies that you program in as channels. The only downside vs. the HF rig going the memory programming way of things is that the mic control, RIT, power levels, etc are actual knobs she will have to get used to operating vs. a menu setting you can program in on an HF rig and assign it to that "channel". But other than that, I think for 11meter ONLY work, and if the budget doesn't allow for a full blown HF rig, grab a 2970DXn2.
I know that some people say that the 2970DXn2 have issues, but keep in mind EVERY ONE that I have seen that has issues or has had issues is a result of a "expert" CB shop tech getting in there and not knowing what they are doing. Usually to get more power output without knowing, or understanding what they are doing, resulting in eventual failure. Heck, take an Icom, open it up, crank it up to 200 watts, get long winded, and watch what happens.
The 2970DXn2 is an upgrade in circuitry over the 2950/2970DX (not just the PA (power amplifier) section of the radio) and the DX series was a lot of updates and upgrades over the original 2950/2970 versions which were an update of the 2900 which came out years ago. My point is that it is a tried and true design, and while it is true that the first run of radios in the n2 series did come out from the factory doing more power than they should, the problem was quickly addressed and for a long time has not been an issue.
Rumors take a while to go away. There are some mechanics out there for example that will refuse to use a popular brand of "yellow bottle" motor oil because they say it contains wax and will sludge up an engine, when in fact the formulation was changed in the 70's and is one of the best conventional oils out there to date per a used oil analysis from a lab.
Ultimately its your choice, but I would stay away from the Magnum 257 or the 257HP radios. They make a fun toy, but are purposely built cheap, and while that's not a bad thing for the hobbyist that wants to get on the air cheap and quick and has limited funds, for long term use, and seeing that you have put enough thought into the purchase to warrant making a post, and asking others, tells me you want something worth while that is going to work, and work for a while.