Hi stroppy,
As a collector, there is a point where all watches become "valuable" and "good"...my own experience, since I want them all! The truth is, no matter the "pedigree" of a watch, if it makes you tick -- pardon the pun -- you should get it -- if at all possible -- since the satisfaction of the watch lover is fulfilled that way.
On the other hand, if you want a "true" watch -- considering we have cells and other gadgets that tell time -- you should focus on history and quality of the brand. Example: an Omega watch, no matter how cheap the components inside, it will never be even comparable (as of today), with and Aldi watch no matter how much care it has been put into the building of the later. Omega being better of course. Then, some exceptions exist to make our life more difficult but this type of example, IMHO, is the general rule.
There is some more to the above: SEARS used to sell some stuff. Among them there were cheap pocket watches. Those watches were mechanical (ETA 6498 movement inside). They can still be gotten cheapish and they are the original UNITAS built. Nevertheless, nowadays it is, for most of us hobbyists and even watchmakers, a heaven of quality stuff...some 50+ years later! And what is best, newer ETA 6498-2 interchange, successfully, most parts with them. That said, I doubt there will be any quartz watch worth the trouble as we usually go about restoring mechanical movements like those. The beauty of quartz is that in most cheap watches -- and not so cheap ones -- we just change the movement when it breaks (if available), substitute the movement for a "compatible" one or simply thrash and buy new. One more reason to go the time honored -- and quality -- way.
Also, about Aldi, we had them in the mid west -- maybe still do, it's been a long time -- here in Miami, they are not in my area so I wouldn't be able to have an opinion of their products...back then, in my home town, I never saw watches in their flyers...I don't even remember the flyers! But, I believe as a rule of thumb that quality and "expensive" workmanship (without the price tag), is something of the past (SEARS example, back then, it was cheap, now it is quality) and the more time goes by, more poor quality and run-of-the-mill products will make their way into our everyday life...the quality, reliability and durability are being dissolved in time! IMHO.
I hope my opinion is not too far from the truth and if so, will be an eye opener to the watch lover/collector as far as what to wear on their wrist. Bottom line: if you like it, get it no matter the procedence but if you are picky about it, get whatever quality/good name is still being made...before it all becomes cheap garbage with inflated price tag!
Cheers,
Bob