And before BT starts his famous "if Alucard is overrated..", I'll recommend him to read that.
http://www.killermovies.com/forums/archive/index.php/t-375568-dante-vs-alucard.html
dvampire clearly proved there than Alucard is overrated, and id369, you were debating in that thread. I don't want to prove Dante is Spawn's equal and Dante even at his prime (DMC2, Super Sparda form. time manip and stuff) can only hope for stalemating 2d age Spawn. But he has chances against 1st, 3rd and 5th age Spawn.
And Alucard? 5th and maybe 3rd if he's lucky.