Welcome to the obsession of growing grapes Doober. If you like Niagara grapes and wine, then it will be fine there, but it isn't a hybrid, it is a fairly old American grape variety. Cayuga would be similar, but makes a slightly better wine and would also be fine there. Cayuga is a bit easier to make into a wine, because it generally is a bit better with less acid and higher natural sugars.
Marquette should make good wine and certainly is hardy enough for you, but the variety is new enough to have only a few years experience with making wines from it. I have made it before and it is good, but a bit shallow in complexity. Once we all learn the best way to handle it in wine making, I'm sure we can make a better wine with it. You could grow another variety to add a bit more complexity, such as Noiret or even St. Croix.
It is a bit late to start, but if you get right to it, you can still do it. Check Double A Vineyards in NY or Andy Farmer at Northeast Vine Supply in Vermont. They are getting close to the cutoff date, so act very quickly and good luck.