Though I like pretty graphics not less than other dude, in this case I advise to wait before hiring a designer. If you were doing an application whose use pattern is clear and firmly known, if everything is basically in there, then sure, add a layer of polish! But as far as I can see, this is not yet the case.

Maybe you'll have to redo your application several times before it takes its final form, and the buttons will change. It'll be better if sunken cost of design work not make you hesitate tweaking your app. After all, I think if your service will be of use, people will use it without any graphics. Look i.e. at tarsnap: it was launched and went to profit with very minimalistic, text-only, non-friendly website.

Whom is your site aimed at? SEO professionals? Nice graphics is not essential for them, I guess. So far it's not clear to me what value your site brings them. So far I see only that it displays whois and search engine info in one place. Nice, but probably not enough to pay for. Have I overlooked something?

Anyway, I'll show your app to my younger brother, who is SEO guy, tomorrow. It'll be interesting to know what he'll say.

Can I have your email, please, so we can better get in touch?