N.
First, when you say really old, how old? I'm pretty sure after 7 years, negative reporting should fall off your report (except bankruptcies which I think it's 10 years). If they have not, just let the credit reporting agencies know that they are older than 7 years and they should take them off.
If they are not at least 7 years old, you might want to just dispute them with the credit reporting bureaus and if they don't get verification from the source that reported the negative information, they have to take it off your credit report. When you dispute items on your credit report with the credit reporting bureaus, the creditors have something like 30 days to respond and if they don't, the credit reporting agencies are required to take those items off. Being that those items are "really old", it's possible the creditors won't respond within the required time frame. Of course, if the information is accurate and the creditors are diligent about responding to the credit bureaus disputes, your dispute will be rejected and the items will stay on your report until 7 years have passed or until the creditor does not respond within the required time frame to a dispute you've initiated.
Either way, I personally would NOT pay anyone that much money to "clean up" my credit. I've heard that all they do is dispute your negative credit items over and over again until the creditor doesn't reply within the required time limit and it gets thrown off the report. I don't know if that's completely accurate, but that's what I've heard.
In regards to preparing for buying a home, I would recommend contacting a good, trustworthy mortgage broker. Believe me, I'm not one to spend one penny more than I have to on anything, but when it comes to home financing, a good mortgage broker is worth their weight in gold in my opinion. I personally would recommend Joanne Tucker who we've financed two homes with and have also refinanced one of our homes with as well. Going through her for our mortgage saved us so much time and the interest rate she was able to get for us was lower than any other source we investigated. We have referred her to many friends and relatives who have used her and were all so impressed with her, they've referred others to her as well. She only works through referrals. She does no advertising. I'm not sure where you're located so she may not handle people in your area, but if not, I'll bet she can refer you to someone good who does. Here's her contact information:
Joanne M Tucker
Certified Mortgage Planning Specialist
Email: ____@____.com
Metro Tel: ###-###-#### Metro Fax: ###-###-####
www.tnthomeloans.com
I'm guessing she can give you pointers on what to do about your negative credit reporting issues as well.
Good luck!