Since you are interested in Sibelius: Symphonies Nos. 1 & 3, here is a list of other items that you may find interesting.
Sibelius: Symphonies Nos. 4 and 5
New Zealand Symphony Orchestra / Pietari Inkinen
[ Naxos / CD - released 1/Jan/2011 ]
On this second volume of Sibelius Symphonies the acclaimed young Finnish conductor Pietari Inkinen interprets two of his compatriot's most contrasting symphonies.