Let me start off with another link here:
https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparisonThis shows CPU and GPU hash rates. For example: if you have an old pentium M, you are getting from .8 to 1.2 kHash/s. At that rate you will NEVER find a block! (well, you will, but will take about 29480 days and 12 hours if my math is right) In a pool you will make about 15 cents in 30 days.
for 1k you can setup a good rig! I bought a someones old AM2 motherboard, CPU, and 2gig combo on Ebay for $100.
You can also find older cards that people are selling off here as well. Newegg sells 7950's from $289 and up and will give you about 600 kHash/s.
If my math is again correct, and the exchange rate stays a $3 per coin avg, that's 1200 kHash/s total, you should find a block in about 24 days 12 hours. In a pool i would expect to make about $185 per month. Solo, I would prob say about $190.
Hope this helps.
Well, when it comes to the ASIC's, the question is will they ever be delivered? I think BFL has been pushing back the delivery dates for about 6 months now! everyone is buying up the pre-orders like crazy and for 3 times the orig price. The other thing about ASIC's is the ones who got the 5gHash/s got the short stick because as soon as the 50 gHash/s come online the difficulty level is going to go though the roof!