Hi gurus, looking for some advice on how to proceed with this.
I'm looking to ebay an at-home AIO lab with 3x2821 (IOS 15.1) routers, 2x3750 and 1x2950 (all IOS 12.2) switches. I've got a myriad of questions and I'm hoping to get some concrete answers before making any purchases. The first step is attaining Switch, then add a component or two and move onto Route, finishing up with Tshoot.
1. From what I've been reading about the exam topics straight from Cisco, the new 300-115 exam is based upon IOS 15.2....I presume 15.1 on the routers would be sufficient, but what about the switches? I'm inclined to think no, but wanted a more expert opinion.
2. Other fora mention that in order to install IOS 15.x on a switch, you need to have minimum 24Mb flash. Can either of these model switches support such an upgrade? Is it external/modular or a crack-the-case-open kind of upgrade?
***** Addendum to #2, 3750 is NOT upgradeable, as per 
this thread
3. Will the older 3750/2950 switches running IOS 12.2 be sufficient for the "new" 300-115 exam and/or the remaining CCNP paths?
4. If no on #3, what other 
cost-effective solution for physical hardware is there? I've just scoped out some 2801's with 384/256 already running 15.1 for about $75 each, so that's halfway there I suppose. That still leaves capable switches to obtain for (fingers-crossed) similar $$.
PS> GNS3 gives me rectal cancer trying to use it, and PT is still a bit clumsy although better than before.
I've got just south of 4 months to do this and want to get started ASAP.
Many thanks for your input.