Hi Danny,I just did a long reply to your enquiry + when I hit submit it just dissappeared ??? So here we go again.
I have driven to and from Turkey quite a few times now using different ferry routes + I did daily logs of the trips with costs/distances etc on here so try "Drive to UK" in the search facility.
The costs of the ferries depends on what route and when (i.e.high season/low season) I used the Ancona (Italy) to Ceseme (Izmir) but it was stopped a few years ago but someone said that there is a Brindisi (Italy) to Ceseme route still going so I'm going to check that out coz its a nice couple of days cruise without the hassle of driving.
Ingoumenitsa (western Greece) to Venice is a nice route as well and the ferry docks right in the middle of Venice with great views.
I've used the www.feribot.net
and its pretty good but there are other sites about which may be on my daily logs