I've got the classic version of the Hardrock, and put the following from your list on it to aid in my commute. It's what works for me, you may/may not want to do the same.
1) 26 x 1.5 Forte slicks. These were under $10 when I bought them years ago. Don't forget to get new tubes if you change tires.
2) Topeak Explorer rack for my panniers; I used a cheap Delta rack before I got panniers.
3) Nashbar expanding rack trunk. It's cheap, durable, holds a lot and is used by many because it works so well.

Does that help?