My kit is from Turbohorsepower. It's a bit out of the budget you mentioned, but I will caution you to leave room in your budget for the extras. Make sure the kit comes with everything you need ie: oil lines, silicone, clamps, injectors, fuel pump upgrade, colder spark plugs, tune. A lot of these things may or may not be included and can jack up the costs big time. Not sure how prices are where you are, but if you have to buy a flash tuner and get a dyno tune may as well plan on $700-ish just for that. An intercooler, labor for the install (unless you do it) and gauges to monitor the system will all run you even more.
To give you an idea the base price for my kit is $3,999. Add on intercooler, fuel pump upgrade, injectors, and radiator overflow relocation kit, and the 2007+ coolant crossover upgrade and it was up to $5,500. Add in the gauges, CMCV delete plates, spark plugs, and misc hardware then the two trips to the dyno it took to get everything ironed out and I was easily $7,000 invested. So as you can see I ended up spending almost double the cost of the kit. Now some things were extra, but not much tbh. I went with a GT500 pump instead of the boost a pump as well as 60 lb injectors instead of the 40 lbs that came with the kit which jacked the price up a little.
My honest $0.02 is plan ahead and leave wiggle room for extras that pop up and if you can't afford that yet then be patient, save up, and do it right the first time around. You'll be glad you did. I saved for 2.5 years to get my stuff, installed it all myself, and couldn't be happier.
In life you must learn from the mistakes of others because you won't live long enough to make them all yourself.
01 Black GT, traded up for
05 Black GT: California Dream hood, intercooled Turbo Horsepower Single kit (61mm) GT500 twin fuel pump, 60 lb injectors, Steeda CMCV deletes, Autolite HT0's, FlowMaster Super 44's, MGW shifter, J&M Xtreme joint adjustable UCA, LCA, and Panhard, Eibach Mult-Pro R2 coilovers with MM CC plates and bumpsteer kit, Eibach sway bar kit.