Good advice from everyone. With EPs, just a 10mm and 25mm plossl is enough to get started. I had a GSO/Bintel 32mm plossl and it was OK as a really wide field EP to help find stuff, but it had fairly significant field curvature that I found a bit uncomfortable. The 30mm Superview (assuming you can use 2" eyepieces) is a bit better but at $49 is worth 1/2 as much as your scope. I have one that I use in my little 8" and I like it a lot, quite often pop it in the 20" if I am after really low power views.
Personally I would avoid barlows unless you can really justify a use for one. I have had a couple and always preferred the view from stand alone EPs and in all the camps I have been to I have never seen a visual guy use one.
With collimators it is easy to spend much more than you scope is worth. Here is a very good guide that I have used
http://www.astro-baby.com/collimatio...on%20guide.htm which outlines the basics of collimnation using simple tools.
Malcolm