Ya know... if I were you Id wait for your itp A1 to arrive. Be sure to get a charger and a RCR123 (the real 3.7 Volt version). Make sure you have a spacer if you get the ultrafire WF139 one. I recommend AW protected series batteries. Do not get an unprotected one since the A1 doesn't have a low voltage alert (its made for a 3.0 volt battery after all).
Besides the RCR123 should get you a bit of extra brightness.
Anyways, once you have it and have tested it out, then see if you really need another light. My A1 packs a lot of power, though it is pretty floody. I have no real application where I need hundreds of feet of throw, so I really didn't even need my bigger higher-powered light, which I had gotten before my keychain light. Now it mostly collects dust.
If you DO decide to get a stronger light, you want your charger to do double duty. You probably got a WF139 charger which charges RCR123, 18650, 14500.
Therefore, you will want the bigger light to use RCR123s or 18650s. (most lights cant use multiple 14500s).
I'd recommend the MG MX-1 as it is 18650 driven, is pretty cheap, and has a large reflector for good throw.
Seen here at...
http://www.shiningbeam.com/servlet/the-126/MG-RX-dsh-1-Cree-MC-dsh-E/Detail
Alternatively, Deal Extreme has a Trustfire TR1200 that is pretty well liked, as great throw, decent spill, uses 2 or 3 18650s and is 45 bucks delivered! Seen here:
http://www.dealextreme.com/details.dx/sku.30683
These are your cheapest options, other than an 80 dollar suspect SST-50 light from DX. I'd at least get a 300+ lumen light, as otherwise it won't significantly outperform your keychain! (except for throw ability)