I've checked the wheels over myself due to hearing about this problem and seems to be all fine(touch wood)
I think it was only on the 09 models, they tightened the spokes on the identical 10.
Any ideas for cheap upgrades???
I concur about the wheel thing was the older original models as mine have held up fine only slightly out of true after 18 months aint bad.
Upgrades.. well you don't
have to otherwise you will replace everything through the cycling bug. Sensible options would be the saddle
if it was uncomfortable (mine was adequate), the bar tape is a must as it was like paper, a saddle bag and computer is all I needed for ages as it was the clothing to ride in all conditions which was more important!