Well, it depends realy. By 1.7 I hope you mean 1700+, which runs at 1.47ghz. Anyway, you may want to check and see if your board supports mobiles. Grab maybe a mobile 2400+ and pin mod it to 17x. That will give you 2261mhz, or just over a 3200+. It would be a tad slower than the 3200 because of bus speed, but fast none the less.
Anyway check your board manufacturer to see if you have barton support. if all else fails, there is always the mobile TB's.