ok.. i ahve only $200 dollars to buy a Video card ..... i found a LeadTek GeForceTi 4200 128mb for only $160 retail... (w/ ViVo model #A250) and saw a GeForce 4Ti440 for 40 dollars more... is iut worth it (same brand but the Ti4200 has an overclocking tool that comes w/ it... whihch one should i go for...?????