Look at it this way - you can buy new and eat depreciation, or buy old and eat refurbishment. New gets you modern avionics, comfortable cabin, and a warranty. Old gets you, well, old. Yes, you can do your IFR with a single KX170B and a nav head. Do you want to? You make the call.
I know some of the gray beards (and, for the record, my beard is turning gray at a rather alarming rate) will poo-poo anything new. "I learned in a clapped out 152 and it was good enough for me!!!"
Are you a mechanic? Do you know how to overhaul an engine? 'Cause a 152 at this point, any 152, is scrap metal wrapped around an engine. The O/H cost of the engine is a significant portion of the value of the plane. I have to laugh when I see ads for 150/152 with 3000hrs on the engine offered for $25k. Yeah, right, more like maybe $12k.
Repeat after me: An airplane is not an investment, it is an expense.
Old sold when they weren't making planes in the 90s. Old don't sell no more.
One man's opinion, worth what you paid for it.