I agree with everything Gar says except the first half of this.
Spend the most amount of money on the highest quality stuff you can afford right now or save up a bit to get the highest quality stuff you can then.
It's true that poorly arranged, badly sequenced compositions are gonna sound bad whether you're using the best of the best or the worst of the worst, but I'm a victim of this frighteningly common mentality that if you're inexperienced, you should start with the low-end stuff and work your way up. It's music; not surfing or learning to ride a bicycle with training wheels where you can outgrow your board or bike.
Would you rather be a n00b with the best stuff out there and then become a top-tier composer and still have the best samples money can buy or would you rather become a god-tier composer with utter shit samples and now have to spend MORE money (quite easily thousands depending) on quality samples? The choice is clear, to me.
I know it sounds dramatic, but this has become one of my greatest regrets in life. I bought all this low-end shit and then some mid to higher-end stuff like ProjectSAM and in the last while, I've really been focusing on improving my orchestration and arranging skills and it's made me realize I should've just gone with the ProjectSAM or maybe Cinesamples stuff to begin with, because now the cheaper, old, "entry" stuff is useless and money essentially wasted.