dilema
Get the suspension that you really want. Then the tires. The little things will happen as needed. Don't worry about "jewelry" like fog lights! Unless you are spending big bucks for high quality lighting, it's just a vanity issue. Use your funds for basic "hard parts" that make your Jeep functional. Many of us have been where you are at! Also..on the basics, don't cut corners to save money! Build it right the first time, make it solid the first time!
Now if you are building a "poser" type street Jeep like we see a lot of here in Washington State, go for all the pretty stuff! Get a mild lift, add many items that can be easily torn off by the trees around here and enjoy driving on the streets! (it's very obvious to us wheelers around here as to who uses their Jeep and who pretends to use it!)
But I think if you are on this website you are a real wheeler so ignore my above comment!
But seriously, invest in a good suspension system.