Welcome to the sickness. On the upside, any back issues that you may have had in the past will improve now. You won't have any money, so your wallet will be thinner and you won't be sitting lopsided.
Let me adress your questions one by one.
Front bumper and winch - a Warn is money well spent. You don't need to buy new, as a used Warn will offer good value, but you may need to be patient. As far the bumper goes, $380 is VERY inexpensive for a JK bumper. I paid far more than that for a custom bumper...but I still spent much less than many of the "big name" bumpers out there for the JK.
Suspension - don't spend ANY money on this until after you've been on a few runs with guys that have modified JK's. Find the one who has suspension that does what you want it to, and then start asking questions. You can fit 35's ona a JK with nothing more than wheel spacers, extended bumpstops, and a sawzall....but that doesn't mean that it's a good idea. There are three factors when it comes to suspension:
-Performance on the road (will your Jeep still be manageable to drive down the #2 at 110 KPH?)
-Performance off the road (will your Jeep flex out and keep up with the pack on technical obstacles?)
-Cost (will you still be able to put gas in your Jeep after the fact)
If you are lucky, you'll like the answer to two of these three questions. I have yet to meet someone that got an answer they liked to all three.
Some of the guys running JK's in this club (myself included) went with Old Man Emu long travel coils and shocks - it's a great performing lift...but it's not cheap to do it right. That said, we're all very happy with both on road and off road performance of the lift.
As far as a gerrry can and a hi-lift on the outside of the vehicle....yup. That's about the going rate for a rear bumper/tire carrier combo with good features. Give or take $300.
Air compressor, recovery straps, snatch blocks....come out to the trail project this weekend and ask MangerineFox. He'll talk your ear off about JK's. I'm stuck working, so I won't be able to help. Even better, come out to the show + shine the following weekend. You can see how the various lifted JK's perform on the RTI ramp.