You won't find a good FID that's 30cm, this is why a lot of people go for flat 30cm ones. There are threads on this, I posted a list in one a while ago of the back dimensions of all of them. I believe the powerlifting federation limits on bench width is 32cm, 30cm is more common.
You want low bench height for leg drive (something I havent got in my bench technique yet, but you should shoot for it)
I bought a 250kg rated incline bench for $200 second hand and replaced the 25cm back rest with a 34cm I made myself. It's not as paddy but I much prefer it anyway. You notice it at like 80kg+, very noticable at 100kg+. I have not had this modification engineering approved or anything, but I use squat stands with big safeties so I feel ok on it. I highly doubt it will break anyway just looking at the way I've done it. I would use it over any of the more expensive incline benches up to 250kg (ironmaster etc., they are all too thin)
If I had to get one without the option of modifying I would go with a cheap incline bench rated maybe to 250kg for incline movements, and then a good flat 30cm+ bench for heavy flat benches. It's unlikely you will incline bench over 250kg total (weight + bodyweight) for reps unless you're a machine / very big.
I might add I had shoulder pain benching until I modified my bench to 34cm (and had some training), though 30cm might have done the trick too.