I recall seeing the 240 at £105 from McAvoys a year or so ago and seriously considered getting one. I passed as I have two 24's and a 27 (ex- Mark Capitalbee 27). All three are excellent and I have no doubt the modern 240 will fit the bill for a 5fpe plinker.
The issue with new Diana's is often the lack of factory lubrication which is an easy fix.
One thing I would add is that the junior Diana's are actually junior size! They may be physically too small for some adults. .177 is always the calibre for these guns IMO.