Just remember, budget lift means cheap lift which means that it does not take you long to realize that you wasted your money.....
Truth is, there is NO cheap lift that will give you a good ride (translation, beat your kidneys to death).
Don't worry about those flat springs...stock springs are supposed to look that way....
You can put on 30" tires without changeing anything....if you off-road, yea, it will rub a little, but you will be fine. 31" tires will even fit.
Avoid the body lift....it says "Hey, I want to 'look' like I'm a cool off-roader but I don't have the bucks to do it right". It will give you a little tire clearance but does nothing for actual trail clearance.
You need to figure out what you want to do with the jeep. If you want to drive around and just look cool without regard to ride quality and ride stiffness, then, the sky's the limit....But if you think you really want to enjoy the jeep and explore this great country, then you will need to do some research...
BTW...welcome...not trying to rag on you, but the most common thing we see here is your exact question..."bought a new jeep...I want a cheap lift...etc"....and we say the same thing...figure out what you want to do with it and do the research....it's like a trip...half of the trip is just figuring where you want to go.....
Good Luck