I used the braided lines from Lindsey Racing - and they have the insulation as well - love them. They have worked well for me (had them installed for over a year). Hardest part is getting the damn plastic piece out of the inside of the wheel well...
Here's the link:
944 / 951 BRAIDED REPLACEMENT FUEL LINES at LINDSEY RACING - Your Porsche Performance Parts Center
Here's Lindsey's write up on their lines:
FUEL LINES at LINDSEY RACING - Your Porsche Performance Parts Center