I love splitting Alpha Cent. Also a good test for how good the seeing is when it is high in the sky.
You are probably already finding that the 25mm EP will beat the 10mm for ease of use and clarity. Most beginners find that the 25mm will stay in the focuser 90% of the time. Personally, the 25mm Plossl is a not bad EP for general use with a small dob, so I wouldn't rush out buying eyepieces until you have a clear idea what you want.
Collimators are a good idea... BUT beware of thinking a laser collimator is the answer. It really only checks part of the picture. A good guide to collimation is here
http://www.astro-baby.com/collimatio...on%20guide.htm
Malcolm