The sites "hits" does not really tell you much as each hit could be 5k or 500k depending on the site. However looking at your site it doesn't seem to use much. I just went through a few of the pages and clocked up about 50k.
If by 250 hits you mean 250 visitors per week and you assume each visitor used a massive 100k then that is 100k x 250 x 4.345 = 106MB per month. Given that ISP's generally measure your bandwidth in GigiBytes rather than MegaBytes then you have little to worry about.
