Why would there be a need to be cautious of trademark issues? Am I missing something here? - Good suggestions about traffic inclusion and checking wayback etc.
I have Texaw dot com. The letters "W" and "S" are very close together and it gets a lot of type in and clicks. Makes over $50 a month. Luckily I hand reg'd it about 3 months ago (i think).
Texus is more of a spelling mistake than typo, but considering it was reg'd in 1997 and has PR2 means it should get traffic and should be worth quite a bit if you develop it. Hopefully if you do it quick enough it should retain some back links (if it has any).
Personally I would've limited myself to about $200 in auction as well. So $230 isn't a bad buy. I'd give this an easy $300+ to resell market.
Good luck with it.