Recommending a network sim

in CCNA & CCENT
Hello
Can anyone recommend a good network simulator? I've got two 2500 routers and a 1900 Cat switch (didn't realise these were menu driven when I bought if from ebay)! Its good to get them working and talking to each other but I feel that I would benefit from having a simple sim too. I've used one in the past and they're great for just banging out commands so that they become 2nd nature.
I don't want anything too flash, just something where I can rattle off the commands.
The one I had before simply had a few routers and a couple of switches on it and a small booklet with all the most used commands. I found it really helpful.
Any recommendations would be greatfully received ; )
Can anyone recommend a good network simulator? I've got two 2500 routers and a 1900 Cat switch (didn't realise these were menu driven when I bought if from ebay)! Its good to get them working and talking to each other but I feel that I would benefit from having a simple sim too. I've used one in the past and they're great for just banging out commands so that they become 2nd nature.
I don't want anything too flash, just something where I can rattle off the commands.
The one I had before simply had a few routers and a couple of switches on it and a small booklet with all the most used commands. I found it really helpful.
Any recommendations would be greatfully received ; )
totts from essex