If that works for you, then great. :) I will only say that 99.99999% of the people on here can't (and most likely won't ever be able to) afford to hire an outside company at that price, or anything even close to it so throwing prices like that out there is doing nothing more then scaring users off. I understand that it's a great thing, it's just out of the reach of most users here which is why I do try very hard to avoid answers like that.
I have heard good and bad things about job postings on here - but it's the main "approved" site that the mods allow on here, so that's what I'd stick with. As for Sucuri I use it for a lot of customer sites here and I use it mainly for the monitoring after some of our sites got hacked thanks to the TimThumb exploits that were going around, and they did the job pretty well for the amount that they charged. I don't use their hack repairs as I've become pretty good at it myself, but when I have seen them do it they do fix the problem. I'm not sure that they fix the underlying issues, but that's where you'd start spending more to hire someone that knows what they are doing.