I agree with with 2far4u, don't spend $99 on the basic RF.  I have both RF 5.5 and Clearview on my desktop. A Dell Dimension 4700, Pentium 4 2.8 ghz  and 4 gb of RAM with a Radone 300 videocard w/ 128mb mem.

The system runs the RF 5.5 great as well as the Clearview - not at the sametime though

Clearview is a pretty good sim, nice graphics and a good choice of trainers.  With a $40 software investment an n $18 6ch controller from Hobbypartz it is a pretty good deal.

The RF 5.5 though is more sophisticated with a lot of user set enviroment features such as wind direction, speed and gusting (turbulense).  great traing landings with gusty crosswinds.

If you can spring for it take a good look at RF 5.5.

Goodluck. You will get a lot of opiinions I will wager - that is good!