personally id go for the honda, its reliable, things like riejus and derbi's look the nuts but thats about it, sheep in wolves clothing,
if you want something performance wise at 125 you want a 2 stoke, yam tzr125, aprillia rs125, cagiva mito 125, all will be capable of keeping with the bigger bikes round the twisties, tlike the gixer 600's /750's (always used to try and keep up on the way to sherburn in elmet

) but will still leave you for dead on the straights,
4 stroke are bullet proof work horses, but dont deliver the power of a 2 stroke, but it will just keep running, whatever the weather, and im sure the cbr125 can still see 65-70mph,
personally go for the CBR it wont let you down,