Side note since the Cube and Trash Can were mentioned...
I want a trash can, but can't really justify it(especially since my 5,1 is better in every measurable way save for the GPU, and even that could be fixed if I could give up SL). I predicted a price dive when the 7,1 dropped, but I think the high base price combined with the fact that you can easily double it running it up to a reasonable configuration hasn't lead to the kind of mass dumping of 6,1s that some of us had hoped. Of course, I will add that I haven't really checked 5,1 prices-it wouldn't surprise me if those are falling since the 7,1 is a logical replacement for many 5,1 hold-outs, while I can see many 6,1 users continuing to be happy with it.
I MIGHT bite on a 6,1 when they go below $500, but given that you're pretty well stuck with the GPU they come with I'm holding out for a good one at that price. Current trends show we're probably a few years away on that.
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Even loading a web page on these devices is a painstaking experience. I used to have a 2006 iMac up until recently and I did not enjoy using it for anything other than playing music or some old games.
If you have realistic expectations about what you can do and use an optimized browser, it doesn't have to be.
With TFF or Leopard Webkit, a lot of pages are not terrible to load. Java intense or flash sites are out. I don't know that I'd want to try Facebook. There are ways to do Youtube, but I honestly haven't kept up with what works these days(it seems like everytime someone figures one out, Youtube breaks another API and they quit working). The latter is a real shame-back when programs like Mactubes still worked, Youtube was perfectly watchable on on something like a dual 1ghz Quicksilver. Even the last time I tried it, the Quad had enough horsepower to do it without too much complaining.