Guaranteed page 1 of Google -

There's only 1 company in the world that can guarantee you the top position in the google search results.

Unfortunately Google doesn't offer SEO services

Have a crack at it yourself, the basics are pretty straightforward. Make sure you know exactly what you're top keywords are, optimise for those, then when you are happy and ready, save any precious budget for the keyword/s that you know will convert, and get some link building done. There are people on this and other forums that have good track record in link building, go with someone who's been recommended rather than a sales email.

As indizine says, if it sounds too good...

Sounds on the cheap side, plus I am always skeptical of companies who "guarantee" things, especially with SEO. Nothing can be guaranteed!

6 months, hmm. It would depend on the amount of searches your keyword gets a month and competition. It can seriously take anything from a year or more to get a page one rank, unless the competition is so low that you could build backlinks naturally and easily and that should rank you quickly because you have more links than your direct competition your niche is extremely competative, so there are a few straigh facts you can glean from that. Everyone in your niche is constantly and actively building backlinks. The big wigs in your competition have been around for ages, so their sites have a really big head start. So you will have a lot of catching up to do. IMHO because of those two factors, the guys that made you the offer are either going to use automated tools, or borderline spam tactics, or worse, which could harm your site and business reputation before its given a head start.

The best advice I can give is to try yourself, like everyone here said. Get your site optimized, make sure your content is written to engage visitors so that they want to like, tweet, or share your site, and half the battle's won. Become active in forum communities, and use signature links, and use video and social media. But use them firstly to market products, and get your target audience's attention. IMHO. Good luck with your site though. I hope it all works out

I don't think that this package will give ranking in ethical way, probably this type of plan is promote website on black hat way.

sjr4x4 hit the nail on the head with this one. No SEO company can guarantee results, that's a fact unfortunately. Some are better than other though.

If you want to see the true skills of the site, check their keywords on the view source option in your browser. They are the keywords the site is trying to rank for. Check Google and see how they are doing, are they even trying to compete on competitive keywords?

The question you need to be asking is a simple one that will separate the pro's from the amateurs is:

"What is your post-panda proposition?"

Panda was a recent algorythmic change by Google rendering most artificial link-building useless. If they talk about forum, blog and web 2.0 posts steer clear, they could very well do a lot more harm than good.

Best wishes.