What part of the world do you plan to live once you graduate?
The East Coast of the US is a big place.
I would recommend (like I always do with questions like this), buy the smallest cheapest sailboat that will fit your needs today.
Then after a year of living on the boat you will know what will suit you better.
I am 65 years old and I would target a 27-30 ft sailboat for $5-10K max.
I just purchased a Watkins 27 for $4k and put $2,500 into rebuilding the
engine.
She still needs some
work but she is in a useable condition.
I am also paying $100 per summer for insurance because I am not covering the cost of the boat just liability that the marina wants.
My
dock is $2,200 per summer for a 32 ft
dock.
I live in
Ohio so I also bpay for
winter storage I do not know what it will be but my
budget is $1,000.
Please also understand not all marinas will allow you to live on your boat.
My
marine will allow weekend overnights but not during the week.