Hi Adeve!
I also started off looking at the 700, but had similar issues as you about support and cost. I ended up with the 505 and I haven't regretted it - it's brilliant and after I'd had it a week I didn't know how I'd managed without it. Although it doesn't have a touch screen it's easy to use.
They seem to be a good price at the moment as well, with many places offering deals, so if price is a consideration that might help.
Whatever you eventually choose there are lots of free books here you'll be able to download