Anyways, I finally stumbled upon Squid Proxies and thought I'd give them a try since they offer money back guarantee if proxies didn't work for my purpose. Sure enough after trying the first batch they got banned right away. So I contacted their customer support and they were very quick to respond with a fresh batch that worked perfectly.
So if you're looking for proxy IPs to crawl websites such as Google, Facebook, etc... and want only the most reliable and cleanest proxies for a great price, I'd recommend Squid Proxies. Don't forget to tell their customer reps what website you're trying to crawl so that they can give you the best IPs for that purpose.
P.S. If you Google Squid Proxies coupons you can find a 25-30% off recurring coupon to save even more money. That's what I did.