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I would give it a try. Having a 4 year old domain (probably registerd to your name) with existing backlinks and a natural link profile is worth a lot. The worst thing that could happen is that your exixting links will be devalued a little bit b/c they are no longer relevant for the topic.

Make sure to 301 incoming links to / or another reasonable page, thus getting the linkjiuce. If you use wordpress as cms this is pretty easy: just add this to your header.php and test if it works (with life http headers or so)

Get a local profile with google, bing etc and start from there.

Either get the Yoast SEO Plugin, which does a <meta name='robots' content='noindex,follow'/> on search pages automatically or if you want to code it for yourself something like:

'; } ?> in the header.php file.

Hope this helps.

Sebastian

If the correct spelling is "one two" then one-two is the clear winner. If the correct spelling  is "onetwo" i would consider both domains equal, but as Robert pointed out "one-two" is a lot easier to read and therefore "better".

BTW: Get both names and also every combination of "one-two" onetwo and .net .com .org  You might even consider plurals and the like.

According to Matt Cutts page load speed is not as important as a ranking factor as one may think.

http://www.youtube.com/watch?v=B3zmP0W26M0  old video, there is a newer one from 2011 which i cannot find

Regarding the usefulness of page load speed: I heard about tests run by amazon and google that more or less lead to the conclusion that 1% faster meant 1% more revenue (to be taken with a grain of salt). But it is obvious that really fast pages produce more pageviews (and ultimately more ad-revenue etc.) and also increasing your sites user metrics (time on site, avg PI ...).

Some tips: go over every element and ask yourself whether you really need that element.

As Robert stated I would aim for a average page on an average domain to load between 1,5s and 2s.

Good ressources are:

www.webpagetest.org

Googles own Tool "PageSpeed"

There is a new German based service called strucr.com which does exactly this: analyzing large sites and their internal linkstructure. But it is mostly for realy large sites.

Other options you have is to use xenu link sleuth and crawl your site by yourself.