I have the commercial flat and the gymdirect incline bench (but not the one you linked). I would recommend keeping the flat as it is one of the only benches you will get that is 30cm wide, this makes a big difference to your shoulder support when benching gets heavy.
That iron edge bench at 28cm wide (so the advert seems to say, check this) is one of the widest you'll find so I'd go with it for an incline option. I would still keep the 30cm flat though, 2cm really does make a difference. I did a search around for a 30cm+ wide incline a while ago and couldnt find one, I checked numerous brands.
Also 1000 others are going to say this but I'm not sure I'd bother with a preacher curl, just do regular curls in my opinon....