All welcome to asm collecting. I know the feeling of wanting to get a good run down. I myself am trying to get a full run myself. And currently have Vol 2, 3, 4, current 5th Vol totally. Vol one I am still working on that myself. With needing 322 issues between 1 to 441 era. Though I have chunks in the 400s, 300s, 200s, 100s, and pre 100s.
Now with your budget I would suggest for one sticking towards the non key 300s thru 441 era. As it won't cost a lot to get. Same could be said for good grade 200s Era stuff too. The 100s and pre 100s is where it going to cost you the most. All bearing of course grade of books you want. If you are going for lower to mid grade stuff sure some could still be costly. But still reasonable price. Higher grade 100s and pre 100s is where books start cropping into the 1,000s of dollars range.
I am glad I started collecting 20 years ago. For me I started my asm run with asm 30 vol.2 and gone from starting there through all present books to past 800. And in the last 5 to 6 years have started working on bronze and silver age amazing titles. For me been a slow go for silver in last few years as real life stuff money has to go to. But again it's all about what grade you want to get and work with your budget. Plus also where you getting books from ie ebay or a lcs and what you going after.