I've done a number of choral recordings. I still consider myself an intermediate rookie in the field. I've had some very nice recordings, and a few that were less than great (although still good). Over time I have moved away from LDC mics to SDCs. I get better results with the small mics. It's also a lot easier to prop a pair up high on a stand.
I have generally not been using spaced omnis - I often record in spaces that would not compliment that arrangement, and I find I spaced-omni recordings often do not present the image I like to hear in a recording.
I decided to go with the AKB Blue Line mics for my affordable choral setup. These mics have very flat response, sound quite good, and the changeable capsules makes them a very flexible option without breaking the bank.
I currently have the SE300B bodies, a pair of CK91 capsules, and a CK94 Figure 8. This lets me to XY, ORTF, and MS recording. I will soon be getting a pair of CK92 Omni capsules so I can go with spaced omnis or a Jecklin disk. Another CK94 (rather expensive) will add Blumlein as an option. In time I will also add another pair of C391Bs (SE300B+CK91) so I can setup two pairs when needed.
I don't know what AKG Prices are like in Europe, but here a pair of C391Bs and a pair of CK92 capsules would fall well within your budget.