Getting a 2nd cat - good idea?

[tuq]

OK, it's been over six weeks since I started a cat thread and I swear I won't make a habit of it, but I'm having a dilemma.

I have a condo, and as such can't have a dog (well, I could have a little yippy one but no thanks). OOT was VERY helpful - moreso than my IRL friends or online research - in how to go about procuring said cat. I made a great choice - he's fun, fearless, and low maintenance.

Everyone loves the kitty - he's about 5 months old now - and when I went to Atlanta last week a friend of mine and his wife asked me to drop him off, even though he totally would have been fine here for 1.5 days.

They have two older cats, one is very territorial, but in those two days he broke down their barriers. They went from hissing at him to where he could jump on top of them and chase them around the place. Plus they have 1000 toys that he was taking full advantage of.

Now that he's back home I feel like he's missing out on a lot because I leave him here for long stretches and he doesn't have much to do.

As such, I'm thinking about getting a second cat from the pound. I doubt I'll get as lucky as this one, but another kitty that he can mess around with all day.

Question: does anyone have experience getting a second cat, and if so how did it change the dynamic of the household?

Also, per the advice of people here I got a male, it was mentioned that they will get along with either gender, whereas two females may have issues. If I do get another, what gender would be best to go with this boy kitty?

I may have exhausted all of you on this topic, but so many of you were extremely helpful that I thought I would ask one more time and hope I haven't run out of luck.

Thanks.

-- tuq