Balance is needed here. There are a wide variety of these APM speakers, some much better than others. I used to have tow pairs of apm141es which are lower down the range, but still quite able. £100 would be far too much for those, I think I sold them for about £50 a pair and they were in good nick. There are other APM speakers which you would have no chance to get for £100.
What models are they that you have seen? I have got to agree with previous posters that it is very likely you could do better for that amount - have you considered Kef Reference 104abs? Or B&W DM4s? Both are better than any apm speakers IMO.
:^