The DC01 Absolute+ in the picture above even though its ex-display will still be worth a fair bit, as long as its got all its tools. The dusting brush in the top of the handle of the DC01 actually belongs to the DC04 Zorbster by the looks of it - the DC01 had a smaller dusting brush originally than that fitted to the DC04.
The DC01 and DC02, as said before are the most desireable to a collector, these being the very first consumer goods from Dyson. The DC01 was 20 years old last year, being launched in 1993. The DC02 I think came out in 1995.
The DC02 Clear, DC02 DeStijl, DC02 ReCyclone (Green model) and DC03 Clear are about the rarest Dysons you can get.