thinking of getting a CTW... some advice please

Hi, I like to do CQB battles and am thinking of getting a ctw from hot spot--the cheaper versions ($600-729) not the over a grand or more type. Any advice? some cqb are $619 and then there is another once that is $730..
hotspotairsoft cxx/catalog/index.php?main_page=product_info&cPath=359_244&products_id=5164
hotspotairsoft.cxx/catalog/index.php?main_page=product_info&cPath=359_244&products_id=5170

Whats the difference, which is better? And is hot shots the best place to buy a ctw in the USA?
Thanks