Yes 1 way links are best, so I'm looking for some systems like tnx or others where I can buy points and then I can get links for this points
What do you mean by "IP address won't match " the idea of safe 3 -way link exchange is so the linking sites IP are on diffrent Class C range to start with.
Don't do link exchanges, there are a few exceptions. If the site your exchanging with is extremely high quality or a authority site. Even if that is the case, limit the number you do, you don't want a site full of links its tacky.