“There's a certain feeling of wading through water with this phone, as every time we went exploring the menus, we were met with a delay long enough to make us doubt our keystrokes registered.”
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I assume you meant "Softbank Mobile" instead of "NTT"...right?
http://www.vodafone.jp/english/products/model_3G/v705sh/index.html
NTT has a similar phone, the SH702i, which seems to have more cosmetic differences from either of the Vodafone models.
http://www.nttdocomo.co.jp/product/foma/702i/sh702is/index.html