If it was me, i would gett the skywatcher, if all your doing is visual work. the overall build quality is a lot better than some other brands not the best but good, i have had one now for a year and a half. The mirror coatings seem to be better than the GSO's and i have even been told that by a GSO 10" owner, my mirror looks brand new and its had a lot O sky time and harsh conditions.
Your eye pieces will be fine for what your doing, you will feel your way around when it comes to that decision to buy more, but for now what you have is fine.
The things that i would definitely look into is the Cheshire, laser collimator, and a Barlow. using these to collimate your scope. the laser to get an approximate angle of the secondary to primary alignment. then using the Barlow and laser to get a reflection of the primary mirror spot. and finally the Cheshire to confirm everything. its important to get it as good as you can. makes life easy and the views spectacular.!
