Why not just try it with your current GeForce 7300GT card. The majority of users have success with these Nvidia based consumer cards. Just make sure you have the correct Nvidia driver to your Avid version & all should be well. No need to rush out to spend another $1000+ on some Quadro card if what you have works for your needs.
Actually, with title effects in BCC, you’re only supposed to drag (no alt/drag… it’s NOT a typical nested effect) the effect on top on the title created with Avid’s title tool. Unless I’m mistaken… it’s been quite a while since I’ve done this.