Hiya Dude,
Welcome to the zone.
Theres 2 svchools of thought on what bike to get after your test.
Do you get a old bag of nails with ***** brakes and suspension, and spend all your time concentrating on what the bike going to do and keeping yourself out of trouble, or get something modern that handles and can get you out of trouble if it starts to get out of control.
I was unlucky enough that the bikes we used to use at work were old dogs, but they taught me alot, plus i still had my own tidy bikes at home for pleasure.
I still reckon some of my accidents i had were cos the dog bikes i had couldn't deal with the situation that had arisen.
If your getting cheap quotes, then i would imagine you have a young head on a older body, so i would say, Go for the aprilia, and change the gearing so its more user friendly around town.
And best of all, good luck with the test and have a greeeaaaaattttt summer riding.....