Have a question about radio and rom!

[Shavkat]

Hi, i upgraded my Titan!
Now i have GPS... and many cool things thanks to PPCGEEKS
But new radio have many problems with connection
And it's too bad
So i want to go back to older radio
Yes i know, i will lost my GPS but at least i will have perfect connection
So i want to ask you guys, what version is best! (Radio&ROM)
I need perfect connection and very fast speed.
Can any1 can tell me what ROM and what RADIO do i need to flash?

And searched some information about this from here, but i couldn't find anything.(there are too many threads)
So please i need full instruction tutorial about going back to old radio and rom!

I have an other question.
If i flash my Titan with older radio, can i able to flash new roms like NueRom and No2Chem?
If no, what ROM is best for older radio?

Thanks!