RE: 2nd Plane Suggestions?
Wait,
It really depends on what direction you want to go. Yes, all the skills are necessary BUT.... if you want to excell at one type of flying over others, you must get a plane that helps you develop those skills.
I like aerobatics, 3D and IMAC. I have no interest in warbirds, whatsoever. MY second plane recommendation would be far different from the same recommendation from a warbird enthusiast or a builder.
Find someone who is VERY good at the particular type of flying that you are interested in, and ask HIM/HER what you should get.
IMHO, you should get a H9 Ultra Stick .40. Fly about 20 gallons through it and get a Showtime .90, fly 20 more gallons and then go directly to GAS. That is the approximate route I took to aerobatics. I am still a beginner, but I have listened to some good advice...and I fly almost every day.
IF you want to learn 3D and aerobatics, you will benefit from foam. Get a Charger CR-1, in addition to the planes I listed, and fly it as often as possible.
IF you want to get into warbirds and scale flying, get a 4* and fly it as often as possible.
IF you want to sport-fly and don't care much for moving ahead, get a H-9 twist or a SIG Mayhem.
IF you just want to build, get a kit and start building.
IF you want to get into combat, build some SPADs and fly as often as possible.
IF you want to ....
GOOD LUCK!!
(oh, and one word of advice, Listen ONLY to people whom you are absolutely sure CAN FLY. There is plenty of flying advice available from people who feel 'lucky' when they can take their plane home in one piece).