You're going to buy something cheap, it won't work the way you have envisioned and you WILL end up replacing it later. Prioritize your purchases and make them one at a time if you don't have the budget to get it all done.
Figure out what you need the most and then get something reasonably priced. You don't have to but something expensive to get something of quality. Do you research on ASC and the internet to be smart with your limited resources.