The Intel® Pentium® E5500 would blow the socks off the Intel Pentium D 920. The Intel Pentium D is using the old Netburst microarchitecture that was being outperformed by much slower Intel Core™ 2 Duo processors. As a matter of fact I remember comparing the Intel Core 2 Duo E6400 at 2.13GHz vs the Intel Pentium Processor Extreme Edition 965 at 3.73 (the fastest of the Netburst processors) and the Intel Core 2 Duo E6400 outperformed it in almost every benchmarch for 1/5th the cost. So without question go with the Intel Pentium E5500.
Intel Enthusiast Team