Help with lenses/adapters needed for Canon G6

Hello,
Ok I have a G6 with the original lens. I have taking sunset pictures that seem to be overly bright. I could turn down the ISO, but it's always on AUTO when I shoot landscape mode.

I was thinking about buying a new G12, but given that a new G6 (at Amazon) goes for $949.99, and I paid $700 for this one,I will keep this and maybe buy new effect filters.

Now,Do I need a LA-DC 58D Conversion Lens adapter, ($44.00) or a LA-DC58B,for putting a UV or a Polarizing filter, or even colored filters?

Has anyone out there that purchased a WIDE-ANGLE TC-DC58N lens ($150.00)and has any regrets?
Or purchased a CLOSE-UP 250D/58mm ($170.00)?

I guess what I'm asking is what would be a basic lens setup and what lens adapter would I need, and if this is even worth the money?

Thanks, for your replies.

Any suggestions on how one would shoot this photo below,with any certain type of lens filters or adapters? I think it's too bright.

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What you want/need for shots like that is a GND (Graduated Neutral Density) filter. And, you want a square or rectangular one, rather than a round screw-n type, so you can change where its "horizon" line is. Here is an example:

http://www.2filter.com​/prices/htpackages.htm​l

For such a small (diameter) lens as the G6 has, you'd need a "hard edge" filter. There is an adapter required to hold the filter holder to your threaded lens adapter, or you can hand-hold the filter if the camera is on a tripod.

http://jefflynchdev.wo​rdpress.com …d-neutral-density-filter/

Or, you can get a similar effect in post-processing (i.e. LightRoom, Photoshop, etc.):

http://psland.lightshe​dder.com/2009/03/14/lr​-grad-filter/

Did you really pay $700 for a G6??? I see them pretty regularly for ~$200, and I bought a mint one this summer for $100. I re-bought one for sentimental value, as the G6 was my first digital camera, and it still takes great shots in nice light. Learn to shoot and process RAW, and you'll be happier.

Hi and Thanks,
I sent an e-mail to the business you posted about those lenses and hope to get a reply soon. I have been mostly shooting at JPG and recently started with both JPG and RAW images.
When I open photoshop CS3 with a Raw image, the editing tools pop open,(not tools palette on the left) then I can post-edit the images, but when I open up a .JPG like that sunset above, the same tools palette does not open up, only the default tools like Curves,brightness,satu​ration,contrast,color balance. etc.

So I guess the only way to edit that photo was to shoot both Raw and JPG from the camera,but post edit the raw image in Photoshop, if this makes any sense.

In PS, the Camera Raw window opens first, which is what you need to convert the RAW file to a TIFF, JPG, etc. After that conversion, you can apply your other settings; curves, layers, etc. but it's always best to apply them to a TIFF because that's a lossless file (unlike a JPG, which is a compressed, lossy file). Save conversion to JPG as your last step.