There are many threads that will cover all the basics you are asking about already. But anyhow, there is no car "made" for 17.5 blinky. If anything, cars are made for MOD. I'd search through the various "which car" threads and soak in all the info you can. But here are the (ever-repeated) basics:
What do the locals run?
What is your budget?
Are you ok with used (and if you are I recommend Xray) ?
and so on..... btw shorty packs are not the "norm" , and they really don't make cars purely based around them. It is really up to you to make it work. I'd stay with standard packs for the higher capacity, more consistent lap times as the clock runs on.
And no, despite what Bert will inevitably tell you, don't rush out and get a TC4.