Id go for a manual 10" and then with the rest of your money get some decent eyepieces. I have a 12" and I find that quite often I cant be bothered taking the bugger out and setting it up. The portability of a 10" is actually substantial compared to the 12". I often wish I had the 10" instead. You really don't give much away in the view at all.
If you have an iPhone or a Android smart phone. Buy Sky Safari Plus for like $15 and use it as a sky atlas to find stuff. Don't need any of this goto malaki unless your a serious planet, double star and planetary nebula observer.
Besides a 12" in the city is crushed by a 6" at a dark sky site. I know this because I have both. Still the 10" will show you lots. Open star clusters and any to about mag 7 will be cake. At a surface brightness of Mag 7+ the individual stars in the clusters are Mag 12-14. A bit tough in the city. Some bright nebula's can be seen too with a filter. I am able to pick up some of the brighter galaxies with the 12". Ive seen Mag 10 galaxies in the Fornax cluster from where I live when they are at zenith. So the mag 9 stuff should be doable in the 10". I also live right in the middle of Sydney.
So try a 10" take it to a dark sky site as often as you can. The views will keep you occupied for years to come. Also if you get a skywatcher 10" it will fold up like an accordion.
I hope I have made your decision even more confusing.
