The OM7 is a tight pattern hyper-cardioid which is good for avoiding feedback when on stage in a loud environment, but for your use it would reject ambiance well, which would make a less-than-perfect room more tolerable insofaras you wouldn't hear as much of it.
The down side is you really have to keep "on" it, i.e., speak right close to it.
The Studio Projects are well received, and I have used one for a vocal mic for a singer and it worked well, but it is a large diaphragm condenser and has different characteristics to the OM7 and the 58 (and any hand held). The hand helds have a low frequency roll-off from about 300Hz down to make them sound natural when used with the lips touching or nearly touching the screen. This is compensation for the "proximity effect" which all velocity mics exhibit.
Side address large diaphragm vocal mics have little or no proximity compensation and so are not designed to be used closer than, say, 3 inches for special effects, like whispering vocals. Some, like the AKG Perception 200 have a switchable LF cut for just this purpose.
I am not familiar with this AKG, but would definitely check it out. It has to be made in China, but I would tend to trust AKG's quality control and design sense. They have been doing this for quite some time.