Hi guys & gals, I'm here sporting a 2.7L V6 2005 Convertible Sebring (Touring) with 158k miles and what brings me here is I'm looking for advice on what I should do to it & for it. Its my baby & I'd like to do whatever I need to do to keep it running to at least 300k miles before an engine/tranny swap or rebuild:

The previous owners neglected the car itself but thankfully it seems they didn't miss oil changes or let it overheat despite it leaking antifreeze & oil like a sieve (The previous owner stopped driving it and just garaged it once coolant began leaking). It had many many issues when I got it and still does, but fortunately I'm chipping away at them and will soon have it in a near perfect condition despite having to use it for work (I deliver pizza, yes I understand how much wear that causes)

Things I can remember offhand that have already been replaced:
Radiator
Upper Radiator Hose
Thermostat Housing
Oil Pressure Sensor (no more oil leak)
Intake Manifold Gaskets
Lower Control Arms (Front Both Sides)
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And this is what still needs to be done:
3 out of 4 motor mounts (Tranny mount is a trooper) (Parts already ordered)
Lower Radiator Hose (ordered)
Right outer tie rod end (ordered)
Water Outlet (ordered)

After I finish everything listed that still needs to be done I will have gotten it to what I would consider a "good condition" meaning every issue I know of has been fixed

But then I don't really know what to do for it after that. I mean of course keeping it up maintenance-wise is going to be priority #1 with the car but I'd also like to invest in it quite a bit, I don't mean I want to do anything crazy like add horsepower (it is an 05' Sebring after all). What I want out of it is for it to last as long as possible before needing a new motor or transmission, for it to handle a bit better, and if its even possible with this car to make it safer (maybe aftermarket brakes would be good?).

I'd like to point out that once I get the tie rod end then an alignment done it should hopefully be the first time I get to drive with it lined up properly with no play in the wheel. So I may be satisfied with how it drives once thats done.

So what are your opinions?