in need of assitance

well my old desktop is done with, im using my laptop in the mean time which is crappy as hell haha. im looking for a dell xps laptop, my old rig was just a crappy dell but i put a 7800GS nvidia and along with 512 gb of ram and this old crappy 2.4GHz processer. yeah, i did run vanguard oblivion etc with really not that much problems but i want to be able to really play games now, im not looking for anything pricey at all i have been looking on ebay, http://search.ebay.com/search/search.dll?sofocus=pf&sbrftog=1&from=R10&satitle=xps&sacat=3736%26catref%3DC6&a14=-24&a26444=-24&a12=26565&a25710=-24&a10244=-24&alist=a14%2Ca26092%2Ca26444%2Ca12%2Ca25710%2Ca10244&pfmode=1&reqtype=1&gcs=1504&pfid=1810&pf_query=xps&sargn=-1%26saslc%3D2&sadis=200&fpos=07718&sabfmts=1&ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=34%26fsoo%3D1&fgtp=  ; and of course i have also been looking on new egg to possibly build a custom. so my price range is defintly a grand and under, i usually invest more money into my video card than anything else..

any suggestions?

thanks in advanced