I can echo what is said above. Unless I total the body, ill keep this rig for a long time. Paid off...so the only "monthly" with this is insurance.
Do it yourself saves tons. Ive done all the work you mentioned myself. This past spring I had to do the knock sensors and harness...as well as all the misc parts to get to it, but then anything old got replaced on the way ( vc gaskets, wire set, plugs, gaskets, fluids, cleaned ICV and Maf while off...etc). I went Toyota knock sensors and harness as too many threads out there about aftermarket issue on knock sensors. All told I think that ran me about 500 in parts..

you mention brakes....well I did the and stainless lines for less than what is quoted in the area just to replace stock ( shop doing stock, me doing TBU).

So I agree if you can diy then you can be into all those repairs including the suspension repairs for well under 4k...id guess near 2k

Don't forget to budget a little money for new tools