Hello!
I'm trying to find a ADC for my project (a lab power supply). The problem I have is that there are simply too many ADCs to choose from. I'm lost

. May someone could suggest a a good ADC or confirm my choice? So far I settled on ADS131A04 (TI) . I only considered TI parts, but I don't really care about the manufacturer, it just stars alligned this way, any other vendor is fine.
To narrow-down a little bit, I defined the following requirements. They are somewhat arbitrary, but I had to provide at least some specifications, otherwise I'd need to choose from too many parts.
resolution: 16bit or more because why not

. I want to have 20000 count measurements, though not sure if I have skills for that (noise, offset, drift, etc problems)
architecture: sigma-delta because presumably it gives better linearity comparing to SAR, but I'm noob here
number of channels: 4+ differential channels
interface: SPI because it's simple and robust
extra features: external reference, I want to attach MAX6226 in ceramic package, this should presumably improve long-term drift.*
price: preferably below $10, but since it's a one-off build I'm fine going a bit above if needed, but I'd like to avoid too-advanced parts that are hard to use (i.e. too many settings).
package: everything but BGA
input impedance: presumably doesn't matter, I'll have an input buffer
freshness: among many available designs, I picked the freshest one. There are 10-20y.o. parts from Burr-Brown, etc, may be they are as good as modern or better, but I hoped that modern parts should be superior or at least better spec'd. Obviously I cannot prove that, if I had so much experience with ADCs I wouldn't ask this question

.
* I know that friends don't let friends buy Maxim parts, but I don't see any other 2.5V refs in hermetic packages on Mouser for a reasonable price.
EDIT: typos