I would recommend the Intel 330 series for a good balance between cost, capacity, reliability, availability and ease of warranty. Since you are keeping your HDD in the ODD bay, a 60 GB SSD will be enough if your budget is very tight. Otherwise I would recommend either a 120 GB or 180 GB for more flexibility and much better bang for buck. The 120 GB has 100% more capacity but costs only ~54% more than the 60 GB.

It depends on how big your applications and games get. Laptop HDDs tend to be under-performers (because they need to reduce power consumption and heat generated) so I would prefer to store them on the SSD. The 120 GB would be a better buy for most people because of this and it does simplify things by quite a bit - you don't have to worry about the cramped storage space in a 60 GB SSD, unless all your applications, games and future usage will comfortably fit within 55 GiB.

I say 55 GiB because 60 GB = 60,000,000,000 bytes = 55.87 GiB. Windows internally uses GiB despite using the GB label. This is the reason your 500 GB HDD has only 465.66 GiB of actual capacity.

As for near future price drops, I don't know. I haven't kept up-to-date on the manufacturer road maps.

45 idle and 50 max is pretty typical for HDD temps in a laptop, nothing to worry about. As long as it doesn't go above 55c for long periods of time (and by this, I mean days) then there shouldn't be any problems at all.

If possible, you can wait until the end of the year (Nov-Dec) for another rather substansial price drop by most manufacturers.

120/128GB SSDs under RM300 is a given.

Both are good choice but personally I would go for Intel 330.