Here We Go. The little, 5-second version that plays when they enter the digital world is awesome, but the longer version is EPIC.
So epic they HAD to use segments of the longer version in the dubbed version of the movie! (when Wargreymon and Metalgarurumon head into the internet to battle Diaboramon despite the fact that they had severe battle scars...it is truly epic!)
Most of the Image Song collections for the characters are certainly worth listening to, although Daisuke's and V-mon's are really about how awesome they are. Fast forward a year, when the Natsu e no Tobira CD Drama (The Door to Summer) comes out, yankingpoor Daisukeup anddown thewhole damn street. The Narrative of the CD Drama is interspersed throughout with songs from the various characters, and Daisuke's occurs at The Climax. Reach For You showcases that Daisuke has grown up a fair bit (he's no longer singing off pitch); and hoo, boy, it shows.
Another good Daisuke song is his 10th Anniversary Special: "Ashita". Much more cheerful than "Reach For You", and much less depressing than "Natsu e no Tobira".