Question : cisco 1841

Hi
I am going to buy this cisco 1841 router after having a bad experience with 1941 !!

1841 :
http://www.cisco.com/en/US/prod/collateral/routers/ps5853/product_data_sheet0900aecd8016a59b.html


Now i have few small questions

(a)i want to do a site to site vpn, so if i buy 2 of this router, will i be able to use site to site vpn without buying any bundle ?? (with the default image which comming with this router)
(b) i know with 1941 , you cant upgrade the ios, but with this 1841 will i be able to upgrade the ios ?? example something advance security 12(4) .. or something like that ??

thanks

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Answer : cisco 1841

cisco 1841 is comming default with 64Mb flash and 256 Mb ram and IP BASE, 12.4(15)T

so it can be upgraded to c1841-advipservicesk9-mz.124-12.bin that required only
minimun 128MB ram and 32 MB flash