Idont think the 9'' will fit with a poor offset as the back edge of the wheel will touch the suspension strut (even with coilovers fitted so you would have to use really large spacers.
If you look at the photos of the orange car i put up for sale, that has 9'' wide tsw rims but the offset is very low on them which means theres no contact with the struts, flip side is you will need very wide arches to accomodate them
The other thing to take into consideration is the larger the wheel offset means you have a lot more loading on the wheel bearings especially when cornering hard, this also makes the steering much more twitchy in a straight line and the slightest input to steering wheel relates to much more movement at the road wheel.
Hope that helps a bit
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