Affordable Flash

I need some advice on a flash unit that can be used on both my 1D classic and xt. I do primarily indoor high school sports photography, which often a high power flash is forbidden at or at the very least frowned upon. Anyway a friend of the family would like to have me shoot her daughter's wedding. For the outdoor shot's during this time of year (October), I thought I may need fill in flash for some if not all the pic's depending of course on the conditions. I would prefer not to overspend on a flash I won't be using very often. So my question is what flash unit would most likely meet my needs for occasional use at a reasonable cost. New or used condition isn't a concern.
I apologize in advance if I haven't been specific enough but a wedding shoot is brand new to me.
BTW, affordable to me with the holidays coming is about $150.00 to $250.00 lol.

580EX I.

I picked up a used 550EX in China. I rarely use on-camera flash, so it's fine for me. It was in your price range. Metz has got some nice units, but with the falling dollar everywhere, I don't think they're cheaper anymore.

Also the Vivitar 285 might be good. The classic 283 is still around, but I don't know the prices. (go for the 550)

I have a sunpak that is quite good and was relatively cheap. I use it now as a backup flash, or to let a an assistant use if they need to.

Vivitar 285 HV, can be had for under $100 each, grab a couple if you want to do wedding.

On the other hand, if you can get a 580ex I for under $300, get it, you might need the high speed sync feather on it for an outdoor wedding.

Thanks for the suggestions everyone. I am doing some background checking to see which option might fit my budget and scenario best. I have about 3 weeks to purchase and practice so it's good I have anytime access to the church which I am sure I will need.

lp120 from www.mpex.com are good. I have 2 and they have been good.

If your concern is really fill a 430EX will be fine. Fill takes little power, unless you want to compete with the sun between 11 and 3.

If your concern is your ability I suggest a Metz unit, purely because pro gear will give you confidence, even if it's unfounded. If this really is your concern I suggest a 5DII, as all the cool kids use 'em. Match it with a 50L and you have a US$6000 pair of brass balls. With that combo, plus a 580EX II you have no excuses. If the photos suck it's down to you.

Good luck.

I am using Yong Nuo YN-460 Flash and its quite good for the amount I paid, as a fill flash its succesful but out of ttl mode,

There are two good options for you....buy a 580EX II, then sell it after the wedding, should be able to get a great return on it...or, even better, rent a 580 EX II.

OR...since the holidays are approaching, buy yourself an early gift and get the above mentioned "brass balls"!