you'll get indexed much faster if you can get linked from another site. I would submit to some directories instead.
if you get a few backlinks on pr 5 you will be indexed within 3 days. Adding your URL to google will do nothing at all if no links point to it.
You might not get a brand new blog to exchange with a PR 5 blog/site as people usually want somethingsimilar offered back to them, however, you can buy a PR5 link. Anyway, you don't necessarily need a PR5 link to get things moving.
I never advise people to submit their sites to search engines because there is just no point. Get a few good links, buy some if you have to and you'll get indexed within a few days.
submitting is not recommended, instead get a few links pointing to your site. take advantage of your recent blog feed url.