Not sure the exact model of the K6-2 you have, but if you buy a brand new motherboard I highly doubt it will even fit inside such an old case. So keeping the old Compaq case (while saving you money) won't do you any good.
$400 is plenty for a decent (non-gaming) computer. Look at Compaq's refurb center on their website. My mom got a 3GHz Celery machine, DVD-player, 512MB RAM, 60GB HDD for ~$300. you can use left over money to get a burnere and more RAM.
$400 is plenty for a decent (non-gaming) computer. Look at Compaq's refurb center on their website. My mom got a 3GHz Celery machine, DVD-player, 512MB RAM, 60GB HDD for ~$300. you can use left over money to get a burnere and more RAM.