Have never looked at a Touran, but if it's anything like similar shaped cars it's harder to pack the boot to full volume in a useable way.
Looked at Octavia and Passat (2007ish models) and went for a Passat. Load space was the killer, plus the Passat was a 170PS engine
The Passat is, despite the similar numbers, a lot bigger in practice. It's maybe a foot longer but a smidge narrower with seats down and has a lot more cubbyholes that maybe don't count in the official measurements. For example you can get 2 wheels in the space between edge of seats and rear doors with back seats down. I don't _think_ the seats in the Octavia go completely flat either (but not 100% on that).
We get two people, 4 bikes (2 road, 2 MTB), 3 weeks' kit (2 x large holdalls, 2 x overnight bags and 2x crates) plus camelbaks, walking kit, toolbox and small box of spares in there with ease. Then we have space to bring back maybe 80 bottles of wine as well :-S.
The "10 cases" year was a bit of a squeaky bum time packing the car, and even more so coming off the ferry, but it went (just).
EDIT: Just read paul4stones post - the parking brake has gone wrong on mine twice in 3 1/2 years. Fortunately under warranty both times. Handling isn't too bad but you know it's a big car if that makes sense. Very seriously considering a Mondeo next, vast, good to drive and they do one with the engine out a Focus ST in it too...