nice choices

Your best bet in recordings/language perfection are Anne Sophie von Otter and Karita Matila. Both are native Swedish speakers, and Karita, being Finnish, will be more familiar with the Swedish that Sibelius actually spoke (since he was raised an aristocrat in Finland). Also, both have excellent recordings of Sibelius songs. And, since the songs you have chosen are probably some of the most performed/well known by Sibelius, I'm positive they've recorded them.

Hope that helps!

ps. Since you're doing "Flickan kom ifrån sin älsklings möte," you should see if you can find Stenhammar's version of it. It's a great song too, and the text is the same, so it's an easy addition once you've learned Sibelius'.