Below is my cpu information and i run ubuntu OS with 1 GB RAM with 80GB HDD. Currently i am happy with the performance of Ubuntu 11.04. I am planning to upgrade to 500GB or 1TB HDD. Is it good idea to upgrade to 500GB HDD with this configuration? How this will affect the performance of ubuntu?

cat /proc/cpuinfo

processor   : 0

vendor_id   : GenuineIntel

cpu family  : 15

model       : 4

model name  : Intel(R) Pentium(R) 4 CPU 2.80GHz

stepping    : 1

cpu MHz     : 2800.038

cache size  : 1024 KB

fdiv_bug    : no

hlt_bug     : no

f00f_bug    : no

coma_bug    : no

fpu     : yes

fpu_exception   : yes

cpuid level : 5

wp      : yes

flags       : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up pebs bts pni dtes64 monitor ds_cpl tm2 cid cx16 xtpr

bogomips    : 5600.07

clflush size    : 64

cache_alignment : 128

address sizes   : 36 bits physical, 48 bits virtual

power management: