To help minimise bumpsteer you want a highish offset on the front, much like the originals, so 35mm or so is the right ballpark to be in.

For looks, escos style 25mm offset is fantastic as it pushes the wheels further out, but you get clearnance issues on both the front and rear arches.

all depends on what is important to you personally, and if you are prepared to cut your arches around.

Going slightly further out on the rear (lower number offset) and keeping the front closer to standard is a good compomise between looks and handling.