For $1500 you can do quite a bit with that bike...
+2+1, or +3+1 a-arms are a must. A top tier aftermarket front shock isn't absolutely a necessity, but always buy the best you can within your budget. Stick to a company that has been around a long time, and that will be around for a long time. Elka, Axis, or Works are the 3 most popular brands, that I don't see going anywhere anytime soon. TCS is out of business and was absorbed by Race-Tech, and parts are pretty much obsolete for them. PEP shocks are not very popular, and I don't foresee them being on the market for much longer unless miracles are done around there.
Notice I didn't recommend Fox. Personally, I am not a fan of the floats. They ride excellent, and are fantastic performing shocks. My issue lies with their reliability. If you blow out an Elka, Axis, or Works shock, you can still finish a race, ride, trip, whatever. If you get an air leak on a float, you're done until you replace the seals in the air spring chamber. Fox Podiums, on the other hand, are great shocks, and definitely look into them if the budget allows.
As far as the rear goes, an axle to match your front width is advisable. +4 is pretty much the industry standard for aftermarket axles. Whether or not you should give some attention to your rear shock is largely dependent upon what you do with your swingarm, and how much you weigh. If you're a lighter guy <180lb and on a stock length swingarm, leave the stock rear shock alone, throwing money at an aftermarket shock, or to have that shock built is a waste. If you're over 180lbs, on a stock swingarm, consider having your stock rear shock rebuilt, revalved, and resprung which runs $218.00 plus shipping with about a 7-10 day turnaround time.