It depends on what you expect your laptop to do. 8gb ram and a 2.4ghz i5 quad core processor is acceptable for almost any computing task out side of playing heavier load video games or specialty IT stuff like LLMs or cryptomining. If your main concern is video games go with the base model steam deck. Also, when you go check out listing for used think pads you will find they contain wildly different specs even if they are the same series. This is because the companies that bought them new X years ago spend some sweet corporate cash on decking them out with the at-the-time highest end options ordered custom from lenovo, and then they throw them in the literal trash a decade later. Some people who dig them out and resell on facebook don’t know a thing about computers and think they are only worth the base options used price.