questionslooking at purchasing a dell touchscreen all-in…

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Since all-in-ones are not as upgradable as laptops or desktops, I would recommend getting the best available specifications you can.

Another option is to look at the Outlet store (refurb yes, but pretty much the same quality as new). They include free shipping and the same warranty. For example: http://outlet.us.dell.com/ARBOnlineSales/Online/SecondaryInventorySearch.aspx?c=us&l=en&s=dfh&cs=22&puid=bb679787 . For a similar price you get:

Processor: Intel Core i7-3770S 3rd gen Processor (3.10 GHz with Turbo Boost 2.0 up to 3.90 GHz)
Genuine Windows 7 Home Premium
Dell Outlet Inspiron One 2330 Non Touch All in One
2 TB 7200 RPM Hard Drive
8.0GB, DDR3-1600MHz SDRAM, 2 DIMMS
8X Tray Load CD/DVD Burner (Dual Layer DVD+/-R Drive)
Intel HD Graphics 4000

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We looked at this once for work.

You may not use the touch as much as you think.
HP also has a touch all in one you may compare.
Are you getting Widnows 8?
I agree with @hackman2007: about upgrading would be difficult or at least expensive. I flash back to the first Micro Power supply I needed to replace. It cost $80 when I could buy the same watts for $15.

That is all I have.

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@caffeine_dude: The more I look at them I agree I can't see many practical uses for the touch feature. It makes more sense in a tablet form because that's in your hands already where it seems like you'd be reaching for the screen all the time on a desktop model. The mouse is such a useful tool on a desktop, almost a reflex anymore, I don't think I'll shell out the extra dough to get the touch feature just yet.

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I tried out a Dell Optiplex 9010 touchscreen with Windows 8 last week at a conference. It was fast and awesome. Granted I haven't used one for an extended period, but my 2 cents.