Wah... spending $1800+ on a compact cam is really alot leh!!! Think the same amt can probably get u a decent prosumer with megazoom, image stabliser + some 3rd party WA/TC/filters...
Think other than my W1 (& the provided MS 128x2mb MS + 4x2100mAh rechargable batts) r Sony orginals, the rest of my accessories (filter adapter, WA converter (0.42x), UV, Cir.P, Star-6, ND4, Closeup +4, 512mb MS Pro) are all 3rd party stuff... Total setup cost me abt $997, which I think is quite a sum spent for a compact cam leow...
I luv the fish-eye effect on my WA... It's pretty fun to take those "big-face-small-body" shots with it, & its macro combo gives me rather cool-looking shots with super shallow DOF!! Haha... But for landscape-wise quality not tt gd lor... My ND4 let me take long shutters of 25-30s w/o overexposure, making the bumpy river look like a flat mirror surface at nite, very nice!