>>About to get a new pc, mainly for C# development using Visual Studio
>>Whats best PC these days for development, preferably 17inch screen(as that's what I currently have) , and fast for compiling etc. ?
>>Tia
>>Gerard
>
>I have been using a Lenovo Z50 for over 5 years now and have enjoyed it. I also removed the internal DVD drive and added a second HD into the bay to have a second hard disk has backup (rarely need the DVD...). Even without the SSD as the primary HD it is quite fast.

Probably one of the hybrid SSD/HD thingies. For compiling C# I'd always go for fast SSD, preferably also 2, source on 1, compile target on 2.
Backup true external better if whole device is stolen ;-)