Dell Inspiron 531, need instructions for spare SATA/IDE HD

my system has AMD Athlon 64 x dual core procc., running Vista home premium. It supports 4 SATA drives. HD is installed on SATA0, CD/DVD on SATA1. So have SATA 2 & 3 avail. I have 2 drives I can install as spare (neitgher of which is SATA.) I tried to research what I needed for this & the more I looked the more confused I got, because they all said something different. Like, I needed IDE/SATA convwerter chip, IDE/SATA power cable converter, SATA Data adapter. PLEASE ADVISE as to what I actually require & steps to accomplish it with as little $ as possible PLEASE. The drives I have are:# 1 =  Maxtor  Max Blast Plus with a 40 pin IDE & 4 pin power connection.  # 2 = Quantum Pro Drive LPS (270S TB27S502 REV 01-H) with 50 pin, 4 pin power connection. I appreciate any help, & hope I'm doing this correctly, this is my first ever post. Thank you