I have a Kitchen Aid that my late MIL bought in the early 1980's. It's about 30 years old and still going strong. Given the baking that you do, you will never regret investing in a Kitchen Aid. It's simply the best of the best. Mine has a 4.5-quart metal bowl and it's totally fine for what I do, which is a lot of baking, including large cakes, huge batches of fondant and frosting, big batches of bread dough, double batches of cookie dough, etc. I think that most of the newer ones come with a 5-qt bowl as the standard. I have never seen a glass bowl on a stand mixer - all the ones I see are metal.
The one I have would probably be closest to the Classic, which is a little over $200 and available everywhere. You can probably upgrade to the Artisan (5-qt bowl) for not much more - I see them on sale all the time for $250.
Have fun with this - it IS and investment but it is sooo worth it. I can't imagine baking without one.