Yes, it would. The 9800GTX is an older, soon to be phased out GPU. Even a GTS 250 will outperform it in most cases. The 780i SLI is OK if you are considering building a dual card SLI rig, but is no more faster or overclockable than an E8500 / Intel P45 setup.
considered the antec 900, but wat caught my attention on the nzxt nemesis, is that it has a temp screen and i watched a vid on youtube and the dude said that you can hook up ur fans to it and make it a fan controller too.