so would therew be a difference in speed between ethernet cable and wireless linksys ae1000
Yes. A direct Ethernet cable would be the ideal setup. Wireless cards and adapters come very close. In either event, you will not notice speed differences except when you are downloaded extremely large files.
You have three viable choices; all good:
1) Direct Ethernet cable
2) PCI wireless card (WMP600N)
3) USB wireless adapter (AE 1000)