Go with the enmey. You don't need an electric hopper unless your planning on playing tourney. Just a nice gravity hopper. HPA is HPA, if you can use it, use it, as even though co2 can be setup to be as consistant and in some cases more predictable than HPA (if you know what your doing) HPA does not kill your orings as fast.
You have to remember on here a lot of guys and gals have played for quite some time and moved on from mechs to faster firing electrics, but here's the thing. When your starting, start simple, get into the game, then decide on how your going to progress after playing a while. Don't get much more simple than an enmey. Sure electric markers are better, but only if you've already played for a while and are experieinced with general maintenance. Then save, get a nice second hand electric later. This way you have experience playing, experience with maintenance (enmey is really easy here), a back up marker and a main marker.
I've been playing for going on 5 years now and only got my first electric marker and hopper this year (Gommie excty/G1 hybrid, very nice and oh my god the discovery of how awesome eyes are!). However I spent most of that time playing vs tourny electric etc at walkons with pistols, so a decent mech will do fine for starting out.