I'm also someone on a budget and have tried all options Amps, K-orgs, c-orgs and random ads off listcrawler and PD. I've had AWESOME sessions for $100 and terrible sessions for $300+ first I'd advise you forgo the traditional APMs and PD listings as in my experience they've always been overpriced . You have to ask yourself what's more important, service or looks? usually you get one or the other, with a few of the K-girls you'll get both but good luck booking them. Personally I prefer eye candy over service. I've been disappointed by K girl looks more often than I've been pleased. Because of that, I rarely partake in the full GFE experience with the K-girls. Therefore even though service is usually good to me it's not always worth the extra mark up. When everything goes right though, K-Girls are the best value.
C-orgs are a cheaper alternative, no gfe service but they used to offer younger hotter girls at half the price. Sadly that hasn't been the case as of late. Last few times they've tried setting me up with older ladies but usually give me a better looking younger option when I tell them I'm walking. If not I just walk and try them later. Overall it's a decent value of you're willing to walk out on the older ladies.
Now the listcrawler ads are usually the most difficult to navigate but also offer the most reward. I've met some of my favorite girls off of listcrawler, absolute dimes willing to do a qv/hh session for 100-150 again no gfe service but their looks are easily worth the price of admission. Service in these sessions vary from girl to girl, most aim to please but a few are a complete waste of time or even worse a rip off( this is the only site where I've been ripped off by a provider). They do have a review option which does help a bit, but it really does take a seasoned monger and time to find the best matches here. I usually tell the provider that I will walk if the pictures aren't close to the ads, often they send real pics or stop communicating which obviously saves you time/money in the long run. If you know what to look for list crawler is the way to go if not I'd recommend the c-orgs but you gotta be willing to walk if they offer you a 50 yr woman which has happened to me. When I'm on a tight budget I don't do korgs unless I've done a lot of research and even then I've sometimes been disappointed. I can't recommend korgs on a budget cause walking bout on them isn't really an option since it'll probably get you banned.