Ollie 125 lover

I am 19 and have recently passed my cbt for the second time. I have been riding my cbr125 around but when i see these 600cc bikes fly past i am so jealous its unreal. so i am now debating throwing in the towel with my cbr, doing my test and getting a proper bike (really liking the R6) Can some one please explain about the whole restriction thing, from what i have heard i will be restricted to a 33hp bike. so is it possible to buy a restricted 600cc? am i too ambitious going from a 125 to 600? (been riding for 3 years but obviously only on small bikes/scooters) i am quite a short person and the cbr 125 fits me perfectly, are the bigger engine size bikes actually larger? If i dont do the test i am going to have to move to the shitty sounding 2 strokes purely for power reasons (got my eye on a rs125) the problem is i love everything about my cbr, riding position sound looks everything apart from its under power 4 stoke engine. So can someone please tell me my next step? another factor is i am going to uni in September for 4 years so probably wont have time or money to do a bike test in this time. so should i be doing it now before it possible y gets harder again?? Thanks, Ollie