Please don't feel coerced into buying a larger bodied/displacement scooter than what you would prefer simply because I and most of the folks who have responded to your op prefer these scooters. Given the stated type of riding and the speed limit of the roads you plan on riding on, you should be able to find an excellent smaller-bodied scooter (Vespa, BV, etc.) that can easily meet/exceed your stated needs and are within your budget; especially if parking space is critical. I have been in a situation where parking space was at a premium. I was able to store a Vespa 300 and my car in my garage without needing to juggle one to access the other. When I purchased a Burgman, I had to park the car outside. After a couple years, my desire/need to park my car in the garage necessitated a move back to a Vespa. Thankfully I am now living in a house with a garage large enough that I have moved back to my preferred ride - a B400.
Whatever you choose, make sure that you are completely comfortable with your decision - and enjoy and ride safe.