Heh, thanks bitseeker!
And actually forgot the Keithley 238
so it's actually up to 6000 EUR already, luckily there's no bank manager or wife involved at the moment, just skipped travelling for a year. Planning to sell the old Philips 6.5 digit, a calibrated Wayne Kerr 6425, and some of the pods for the HP 1652B to offset the cost slightly. Also got a Conta 20011 laying around that I was planning to sell, but that French piece of misery is so badly assembled that I'm contemplating posting it to Dave, it gives a new definition to the word crusty.
And by all intents and purposes, the Weston Cell and Keithley 130 are toys. The DP832 behaves like a crappy toy, so there's that. The rest gets used pretty heavily, especially the 2001 sees a lot of use. Just for some serious home fiddling though, started working on my own 7.5 digit multimeter design a while back. So might need to lob an electrometer onto the list