I could be wrong here but I see Bitcoin price going down as easily mined bitcoins from asics flood markets to pay for their equipment.
This will make GPU's move to litecoin but all will not be supported. I see about 10 to 20 percent will be able to profit as litecoin can't support all GPU's due to it's low price.
I think asic miners will trade for litecoins with their bitcoins as a hedge and their will be more litecoins available from the increase of GPU activity. Basically bitcoin value will drain into litecoins making litecoins more equal with bitcoins. This can all be skewed depending on which coin fiat will drain into from money coming in to the markets.
Another variable is the support of commerce aka trading of coins for goods and services. If bitcoins has more practical applications for uses in purchasing then it will hold its place as gold and litecoin will begin to be taken more seriously by merchants. Litecoins do have a quicker confirmation algorithm however bitcoin is more well known. This will be a natural step for these currencies at their stage of development.
As GPU's try to move in to litecoins many will bled into the alts. I believe the best candidates would be the ones with most dev support and public attention. Public attention will be due to price movements going up. If the prices go higher the more attention will be drawn.
I presently am very interested in DGC. I am seeing a great deal of motion and attention being directed to this altcoin. I really don't know why to be honest as I guess it would be the support from honest pools and or devs doing a good job.
http://digitalcoin.co/Here is a lifetime chart on cryptsy
Now compared to most other alts I see very low activity. Here is WDC as a comparison.
BTB could be a coin to watch as from what I hear they want to actually take over Bitcoin and are very hubris in their expectations of the coin the devs have some real good Ideas but it will take a great deal of time for this coin to prove itself. Some of the great features is the way it is confirmed as it does have other additional security applications.
Technical:
* Proof of Stake + Proof of Work (based off of Balthazar's Novacoin code as well as the RareCoin and Fairnova projects)
* No premine like Novacoin has been accused of having
* Dynamically adjusting difficulty and reward calculation
Could be a contender years from now.
These are just my opinions