I need good recommendations for seo guaranteed ranking.

Well that all depends on what you're looking for. A $50 budget will get you nowhere close to ranking for a competitive keyword though. Are you looking to rank at a certain position after one service?

I would suggest that you learn a little bit about SEO if your are going to outsource. This way you know what is involved and how it relates to the expenditure. Other words, so you don't get ripped off. SEO can cost many hundreds if not thousands, per month...
Is your competition spending that type of money? If so, $50 isn't going to do much for you.
When building a business you want a plan, and a budget, and you also want to know a little bit about what you will be managing. If you intend to make the Search Engines a large focus of your traffic, then you will want to create an SEO plan that will do you some good. A consultant will cost you a fair penny to create a plan for you.
But you can create a plan that includes a task list of monthly things that need to be done. (article writing and distribution, web 2.0, forums, blogs, and other types of backlinking) You can then outsource some or all of these tasks individually or in group. But you maintain the management of it and not just let someone run a muck with your business name all over the Internet.
Don't get hasty, it will end up costing you non productive money. Learn and plan, then hire with confidence as you follow your plan.

Yeah, I have to agree with Ken.

You can waste a lot of money if you get caught up in buying products and services if you don't have a proper strategic plan in place for them to be used and implemented.

Figure out your SEO plan first, then you'll have a better understanding of what tools and services are right for the job.

Seo guaranteed:

well try to use twitter and rss.

example: twitter.com/seo_job

underscores act like a space rather put it together in one word.

then subscribe to rss feed. Make sure that rss feed is related to your niche.

don't forget to put a backlinks to your site right on the profile.

If you are planning to rank for keywords which you already have decided upon...check out my link service. Also as everyone said before, figure out your strategies and goals first before spending money on anything.

Good Strategies always play important role to get high ranking in Google and Other Search engines.

strategy and plan most important to rank keyword on search engine first page