[crafter ga6]

Hi everyone
I'm looking at buying my first lot of recording equipment, which I will initially be using for recording acoustic piano and guitar. The problem I have is that I live in town right by a busy main road, and as it is a rented house I can't sound treat a room. Given the circumstances, what mics would work best? Would I be able to get any decent results with cardioid pattern condensers, or are there dynamic options that would do the job? I am looking at probably no more than £100 per mic.
Also if I do go for condensers, I know that either small or large diaphragm models can work with guitar, but what about piano?

Thanks