I don´t know what to buy,  ???, which is the most powerful card in performance: Geforce 4 Ti 4600, Ati Radeon 9000, Ati Radeon 9500; and in quality?, and in price? ???, and please tell me why (with results, no with thoughts)

Hmm...

This is not an easy question, and largely depends on your needs, the money you want to spend, and what the prices those are where you live.

Anyway, the Ti4600 should win about all Benchmarks against the 9500 or 9000 (both non-pro).

The Image Quality should be the best with the Radeon's though, as NVidia slightly reduced Texture Quality in their 40.xx Detonator Drivers to achieve higher performance.

If those are your only options, the Price will probably draw the line where to go.

Personally, I'd not buy the R9000, as the old R8500 or /LE are quite a bit faster, and can possibly be picked up second hand for very little money...

The R9500 (non-pro) I think is still a bit too pricey (at least where I live), and loses the Price/Performance ratio vs. the Ti4600.

If I was looking into buying 'right now', I'd look into Radeon8500, Radeon 9500pro, or a Radeon 9700 (non-pro) for high-end. The 9500pro is certainly on par with the Ti4600, and wins if Aniso/FSAA comes into play, plus it should win Image Quality comparisons.

And the 9700, well, is still quite an investment, but delivers ludicrous performance and image Quality (e.g. 4x Aniso + 4x FSAA literally doesn't cause any heartburns to this monster, putting it at unsurpassed quality levels).

And the good old R8500 (now being sold with minimal modifications as "R9100") is still very good, probably has the best price/performance ratio (if you get a good deal on it).

As said, it's all a matter of the exact prices you're getting where you live, and performance level & Image Quality you want to achieve, so I can't hands-down recommend a single of the candidates you listed.

I'd also recommend browsing the various Benchmark pages, to get the Reviews of the respecive Cards :

NVidia GeForce4 Ti4600 :
http://www.anandtech.com/showdoc.html?i=1613

ATI Radeon 8500 :
http://www.anandtech.com/showdoc.html?i=1558

ATI Radeon 9000pro :
http://www.anandtech.com/showdoc.html?i=1655

ATI Radeon 9500pro :
http://www.anandtech.com/showdoc.html?i=1756

If you prefer other Review Sites, you could also try :
http://www.ocworkbench.com/index.stm
http://www.tomshardware.com/
http://www.3dgpu.com/
http://www.extremetech.com/

...to name a few

Yep, the Radeon 9500pro is an excellent choice you won't regret

And indeed, no matter what Card one is running, no-one is left outside if help or advice is needed.

This used to be true in the past (ATI Rage128 Drivers were a terrible example ), but with today's Catalyst Drivers for the Radeon's, that Situation has greatly improved...

Since NVidia reduced the default texture Quality in their 40-Series Detonators, I'd even say, the ATI Drivers are better in many cases.

Yet, there will always be a few bugs or errors, no matter what card.

(Haven't tried the latest 3.1 Catalyst yet, but it's supposed to be good.)

So far, I haven't run into any severe Problems with the ATI Drivers.

he said that he couldn´t play games well and he wanted to change his ati or something similar

Thanks, I feel better, I was decided to buy a radeon but this rumour scared me,  now I want to buy a radeon.

Check Anandtech

www.anandtech.com/video/showdoc.html?i=1794