Hi Arif,
Cost *always* matters.
My suggestions would still be the same really, but you do need to say what type of services you would be catering for.
Page one of your document is, I think, lifted from the 3800 series router spec sheet, with the exception of 1.2Gbit throughput. I can't choose what router to go for, but your choices are 7200 NPE-G2, ASR or 7600 if budget extends to it. The ISR's won't provide you the throughput you need.
Page two of your document describes a 6500-E series switch pretty much exactely. You'd need a SUP720. Your switchport density will dictate which chassis to go for. (6503/4/6/9) See http://www.cisco.com/en/US/products/hw/switches/ps708/index.html
Money no problem?, 2 x 6509-E in a VSS pair filled with 67XX line cards.
I've no experience with ASA's and only very limited experience with old PIX's so I can't help you there. I'd suggest having a look at SNORT in addition to other commercial IDS solutions.
It might be better if you go and read through the datasheets, draw up your proposed design and then post that back here where someone might critique it for you.
The other alternative is to engage with a Cisco partner, your spec sheet is detailed and may well result in significent sales for a partner - I'm sure they'd be glad to help you out.
Without being too blunt, is this a study type project?
HTH
Kevin
