For 2005, you must file either as a dual-status alien or as a resident alien under First Year Choice (which means you cannot file until June). Read other posts for details or download IRS Pub 519 from
www.irs.gov.
You can file the Form 8843 for 2004 if you wish, but the IRS will not track you down and deport you if you do not, especially if you opt to file as a resident alien for 2005.
If you claim your wife as a dependent while filing dual status, you get to claim her $3,200 personal exemption. However, if you wait until June to file as a resident alien under First Year Choice, you get to claim her $3,200 personal exemption
plus get an additional $5,000 on your standard deduction.