what eyepieces do you already have with thw xt10?
not very many people would use ep's less than 6mm, and the 2mm in your scope would give 500X mag i think (fl1000mm or is it 1200mmm?) which might not be very useful
I would advise buying maybe two, a planetary around 6-9mm, and a scanning ep around 17-20mm, and buying higher quality. If you want good eye relief look at the WO spl series (i have the 6mm & it is a good planetary ep), baader hyperion, or vixen LV range. I think you would be happier with them.
If you want to go cheaper look for an orthoscopic ep for planets, there s a japanese retailer who sells at very competitive prices
http://www.kkohki.com/English/kkohkiparts.html