I went this route at the beginning, a cheap top plate lift, new OEM springs, and my springs were shot in 6 months and had me just sitting again at factory height, with a top spacer on.
I did it properly this time, ordering the parts over the span of a month or so, so split between 2 cheques (the parts are even more expensive here in Canada vs the states). It was an excellent decision to upgrade to a proper OME lift.
A cheaper route you can go is the OME 927s upfront with the cheaper Rancho line RS5764 I think it was.I got them on a wholesaler closeout deal on RockAuto for $30 a shock, and they actually ride great. They're a lot cheaper than the Bilsteins everyone recommends.
Everyone will call me out for saying this, but for the rear, I have been using the OEM shocks for months still, even with off-roading, and they haven't blown yet. I do suggest replacing them with extended rear shocks, but if you're trying to keep the cost down, you can do the rear shocks a few weeks later, they will work with a 2-2.5" lift for a bit without blowing. I do plan on replacing mine soon now, since I have new ranchos upfront but old OEMs in the rear still.
The jeep rides so much better with the heavier OME springs too, it rides like it was meant to now, stiff but very smooth.
I was in the same boat as you, reluctant to spend the bigger money on a proper kit, but I ended up doing it anyway and wasting money on my first try to cheap out on it.
For upper control arms, if you want them too, they've kept my suspension angles perfect with 2.5" of lift, there is a new cheaper brand "Deeke's" available on US Amazon for about $200 instead of $609 for JBA upper arms. I do recommend replacing the ball joints that come with the Deeke's lift UCAs though with Moog K6292s.
For my UCA and ball joints, Springs and shocks, I spent about $1000 in parts and did install myself, if you just did springs without UCAs and budget Rancho shocks, you could do it for $650-750 probably and have a jeep that rides and drives much better on and off road. The OME lift greatly improves on road ride and handling too in my opinion, it's not a purely off road benefit.