Just trade my DP2 M for a DP1, so all the accessories need to be updated.
These are the four most usefull upgrades to your DP2. I bought them all from source with original receipts. You can see their description and retail price in these links. I am selling them for 30% less and they are all in mint condition. no sign of use.
Sigma optical finder for DP2M $100http://www.adorama.com/SGVF21.html
Close up lens adapter $80http://www.bhphotovideo.com/c/product/894784-REG/Sigma_am2900_AML_2_Close_Up_Lens.html
L bracket+ Grip $100http://www.luminous-landscape.com/reviews/jlm_sigma_grip.shtml
Entire set for $280 net of paypal and shipping.