恢复灌水：今天下午的Phone Interview

I got a phone interview this afternoon by AT&T yellowpage. The person who called me is the director/manager of the development team. He asked me quite a few technical questions and luckily I answered all of them (because they are not hard questions, hehe). In the end he concluded with a word "perfect" and afterwards the HR person asked me to pick a time for on site interview next week. I know this director worked in my last company as well.

I am wondering if I should try to postpone this on site interview for about one week becasue I am waiting for some news from the companies (with my dream jobs) that I applied for (just applied, no calls yet).

You guys have any advices for me? Thanks!