Here is the best strategy to earn big money with ASIC miners...
Take your 250k and use it to invent a time machine. And now forget how that invention has already made you the wealthiest man in the world and travel back to the summer of 2012.
Buy a couple of AMD GPUs just to familiarize yourself with BTC mining. Don't go crazy and build a massive GPU farm or buy those intriguing FPGAs you've been reading about. They will all be obsolete by the beginning of 2103.
Sometime during the summer of 2012 you will be reading here on BTCtalk about 4 companies who are planning to release ASIC miners by the end of the year... Butterfly Labs, bASIC, ASICMiner and Avalon. Now here's the really important part; the first two companies will completely flake-out and rip-off their customers, the third will produce functional miners that are super high-priced and the last (Avalon) will pre-sell their first batch 66GHs ASIC miners for $1300.
Order as many of the first batch Avalon miners as is humanly possible! And maybe slip those Chinese fellows some extra cash to skip ahead in line. Being first in line is VERY important. Order more than you can possibly host at home. You will soon be able to sell the extras for 20 times their original retail price. However, do not (under any circumstances) order from any later Avalon batches. The company will self-mine with them for many months before delivering the dusty miners to the customers.
Your shiny new ASIC miners will arrive nearly on time around the very beginning of 2013. You will now be the king of BTC mining! You will be mining hundreds of BTC every day (depending on how many miners you bought). Save those BTCs in a secure offline wallet and don't spend any of them until you hear about another company developing much more efficient ASIC chips... Bitfury.
Bitfury is important because soon everyone and their brother will have these loud, hot ASIC miners built by Avalon (and later, Butterfly Labs) that suck 6-8W/GHs and BTC mining difficulty will absolutely skyrocket. But Bitfury miners will use only ~1W/GHs. They will look like amateur crap, be finicky as heck, you'll have to buy tons of fans to keep them cool and probably quit your day job just to keep them running.
Now open your very full BTC wallet and preorder every Bitfury August batch card you can afford. Towards the end of August, sell every Avalon miner you have to clear space for your Bitfury gear. And surprise! Your Bitfury miners will arrive on time while people are still waiting for their year-late Butterfly Labs miners.
And now here's the really, really important part... sell every remaining BTC you have as soon as it reaches $1150 near the end of 2013. And keep selling every BTC as soon as it's generated by you quiet, cool Bitfury ASICs. Go outside and enjoy the weather, take that vacation you've been waiting to take, kiss a girl (or boy), walk the dog, etc. Do anything you want, you're rich! Oh and don't forget, you still have that kick-ass Time Machime to play with.
Don't worry about buying BTC again until January of 2015. And certainly don't bother trying to keep up with the rising BTC difficulty by buying miners from KNC, Bitmain or Spondoolies.