[c-nsp] Multihoming with 2801

[Pablo Almido]

Hi All, I am planning to configure Multihoming for my network in my
job, I have a class C  /24 to announce, we have recently getting our
own ASN, currently we have 1 router 2801,  I want to take only a
default route from each provider, and announnce my network to each
ISP, I have read in another posts that I have as minimal 256 DRAM,
but I want to know If is possible my router can work well with 128
DRAM only taking default routes.
If I had to buy more memory  (it is expensive for me)   where I can
find third party memory as kingston or other well-known manufacturers?
Can Anyone give me some links.
For peering with my other ISP can I buy a router 1841 with 128 or more
DRAM memory or I should purchase other router 2801.  We have both
circuits with 4MB for internet access.