Charityvest is probably not a good option for most...the bulk of our users are non-US and < $20 (though we do get some big donations from time to time, so it might be a nice option to have if a US donor wants to make a large donation). Also, I'm not sure whether how often we receive mail at that address considering none of us actually live in WA. Krydos would know if that's an option or not.
Note that anything sent outside of Paypal won't count for anything in terms of a Tommy invite/space upgrade/ETA change/etc. unless you were to post and request it be counted. Our systems depend on the Paypal API for donation tracking, only a normal Paypal donation reports this way (I'm not sure if giving fund donations would report on the API or not, I suspect not based on how GF works).