I like Rattle's Sibelius, actually I love his 3rd, just a very nice recording with a lot of color and life...and I like his 7th too, and
Night Ride and Sunrise, which really is a great performance. The 5th is good, but there are so many other awesome 5ths around. Same for his 2nd. I think you'll really like that disc.
I'm still listening over here, longears, though hampered by school now, going to start on Ashkenazy I think next, and also Sanderling. Also looking forward to Mackerras's 2nd and 5th in the "to listen to" pile.
For live Sibelius, LA Phil and Salonen are doing a full cycle in September/October, in L.A. and London, with some nice pairings, I wish I could make it out for that. But as consolation I will at least hear this fall our local orchestra in the 2nd, and Houston is doing the 7th and Finlandia, which is great, I adore the 7th particularly and am so glad to see it live.
Also worth mentioning, Hilary Hahn has recorded the Violin Concerto, and Schoenberg's, with Salonen and SRSO, to be released next year. I look forward to hearing her playing on that piece.
