Cornerback was my choice. I think in this day and age of the NFL, having a great cornerback tandem is no longer a perk, it's a neccesity, with so many great receivers in the league. We're really stacked at the front four (a huge DT would be nice though), and that will help with linebacker play more than it will with cornerback play.
Number 10 has made some very good points for drafting a receiver in the first round, and hugegmenfan has also made some good points about taking a linebacker in the first as well. I wouldn't be upset if we took either one of those posistions in the first round instead of CB.
The only reason I think that we could do with out a linebacker or receiver in the first is because there will be better depth for those two posistions later in the draft, where as good cornerback depth will be lucky to last to our second round pick.