For me I like to have enough for Epic game but not swarms so I have a fair mix and a bit more than you listed. It does feel like it's hard to keep up but no-one has to buy everything. I hate, hate, hate proxies but guess what, I've starting to come a round with the new releases not having enough cards for even the expansion. Honestly, again this is me, I feel that the game will be very well balanced with the X-Wing Integrated Droid fix and the Tracers for Ordnance. I've even considered stopping there with my collections. Seriously I have a bunch of stuff and enough for two 400 point Epic sides to go head to head. It's a bit pricey to get everything and not have to proxy but as I and others have said that not really necessary. Will I stay in and keep the purchases, I'm not sure. The Gozanti, oh yeah I'm in for that. Wave 8? All I want is tracers and Integrated Droid. So???

Buy what you want for a fun game, then add as needed for casual play. It is easy to be caught up in it all. There's a reason some call it plastic crack.