As shiftizzle says....
I got an Ion and am very pleased with it. Yes it aint a dye or ego or whatever, but for the money it rocks!!
As shiftizzle says immediately get a Q-lock to ensure you secure your hopper on properly. I would also recomend a CP OOPs (On Off Purge System). Don't know where you are situated but LPS fitted both for me for about £50.
As for the recomendation for an Egg. Don't know enough about the hopper you got with your package, but I got an Egg and other than minor minor niggles with the battery door (either do mod or use electricians tape), it keeps up with my Ion and hasn't let me down once.
Mask... they are always personal preference... but you got one so thats the important thing.
Oh, get an air bottle cover as well if aint got one....
Ultimately you will want to upgrade your air system, your mask, buy gloves, etc, etc, etc... however my two penneth worth is to just get the q-lock and OOPs on your Ion to start with, then start attending walk-ons and then see what else you feel you need. Try not to get caught up in upgrade mania if you on a budget, which I think we all are in some form or the other.
Hope helpful.
BTW well quoted shiftizzle....
welcome to the hideous time consuming money spending but absolutely amazingly brilliant world of paintball