If you like Sibelius/Segerstam (I certainly admire his Mahler), I strongly recommend you hunt down the Chandos set he did. In my opinion, the Ondine (Helsinki) is good, the Chandos (Danish National) is great. There is also a CD of some of the Poems, also on Chandos. Over my system, I like the sound of the Chandos better aswell.
I feel that the Maazel/Vienna made the trip to CD quite well and still pleases after all these years. The Pittsburgh set he recorded for Sony can't compare performance-wise.
Bernstein’s 5 & 7 with Vienna (DGG) are great performances in excellent sound (the last movement of the 5th is magical). Mr. Bernstein keeps his bullshit to a minimum here as he couldn’t quite manage to do with the 1st and 2nd Symphonies with the same forces (I happen to like HIS bullshit, though. Quite a bit!). His NYP set is also very desirable but, unfortunately, the sound of some of the recordings is vintage CBS ”gee, I’ll hang the mikes and start the recorder, but I’d rather be doing (derive your own meaning) Dolly Parton.”
The Ashkenazy set is not without interest—and has good sonics. The 1st, 6th and 7th stand out.
Alexander Gibson—on Chandos—has an excellent set that is often bypassed when considering Sibelius symphonies. Good sound. The Scottish orchestra plays with distinction if not the ultimate degree of polish.
Vanska/Lahti are in wonderful sound, but can't compete with the raw energy and mystery of Bernstein, Karajan (EMI), Ormandy, Maazel (Decca) and Davis (Philips). However, no one, again, no one, does the last movement of the first symphopny like the Lahti lads! Their first symphony, as a whole, is probable their finest account in the canon. Unfortunately, their 2nd, 5th and 7th are downright dull. The 3rd is ok—but then, who can really screw up the 3rd—the 4th and 6th are good.
Berglund, well,...
The mono Ehrling is a fantastic set! But then, if I want something in mono, I’ll speak to my wife.
Jarvi is, perhaps, the best conductor an orchestra can employ if sightreading at a recording session. Has he really recorded ANYTHING that doesn’t sound like a competent run-through?