Im after touchscreen player for my st150 there are a lot on ebay range from £50-£150 not sure which mode will fit what I need to look out for also if its straight connect to original cables ? 

If you search Android Radio Fiesta you will get a load which will fit, you should also get the adaptor in the box which converts the leads to ISO connections.

Be aware though, these aren't brilliant. I had one for a a short while but it was clunky and poor quality, also the audio quality wasnt as good as the Sony, also the clips didn't quite grip the cage in the dash properly (where as the standard Sony 6-CD changer is fine) also I found the adapter for the leads and the thing which reads the Canbus was a little too big for the space behind the head unit.

The Android ones run a basic version of Android with a basic interface on top to mimic a modern type touch screen that many manufacturers fit, but I found it a lot lower quality

 

In the end its quality annoyed me so much I took it out and put the Sony back and its just sat in drawer in the garage since

to be honest i think your better off going for a second hand branded model the resale value is low and usually owned by enthusiasts so well taken care of. the cheap china knockoffs are cheap for a reason 

 

this one for example would of cost £1000 brand new. it is an excellent unit had one like it installed in my mk6 fiesta good quality sound good screen and the best satnav i've ever seen in a built in radio. the only negative is lack of dab. 

http://www.ebay.co.uk/itm/Sony-XNV-L77BT-Double-Din-Sat-Nav-Multimedia-In-Car-System-Built-in-Bluetooth-/262616144473?hash=item3d25245a59:g:RjYAAOSwFe5X0T8Y