I've seen your thread on PistonHeads and you seem to be having real trouble going from the 130i to the CTR and back.
I also considered a CTR briefly when looking for my next car and glad I went back to a 130i (yes I'm one who regretted selling first time around). CTR FN2 prices have reduced while 130i prices have increased from what I can tell since I bought.
Ultimately you're buying an old but very capable car for not a lot of money and regardless of which car you go for, always plan for things to go wrong.
A lot of things on the N52 engine can be accomplished by a DIYer.
You're aware of the major pitfalls so just budget that in to your costs.
As for my history...
My previous 130i needed VANOS solenoids replacing which, as Nyxeris says, is an easy job and I only had to do these because the car had been left sitting around/doing short journeys by previous owner. My current 130i has not needed them doing and shows no sign of this as it has clearly been looked after better (I can tell because when I open the fuel filler cap, the gubbins underneath are lovely and clean compared to my previous 130i which was clearly quite gummed up).
Neither of my 130s needed the waterpump doing. I suspect it *might* have been done on my current one but there is no paperwork to back it up. Same with the old one. Just replace the coolant and you'll likely prolong its life anyway. Even if it does go, well you knew it could so you accept the relatively low cost of it (in the grand scheme of owning the car).
I've started putting my current 130 on the track and am finding brake components have needed replacing but these are really wear and tear items as far as I'm concerned.
And for the most cliched bit: what else can you get for your money that gives you a NA straight 6 with decent power and reasonable fuel consumption, rear wheel drive, manual, hydraulic steering (pre-face lift) in a reasonably light car? Nothing is the answer because I've really tried!
As for weight it's probably my only complaint about it but that is given I'm tracking it (as mentioned above). Mine weighs approx. 1400kg.
Anyway, as a "do it all" car, nothing comes close. Buy one already
P.S. my 130i is on 86k if that's helpful at all.