techxupport,
This is where you have to be carefull. The older 2610 and 2611 only support 10Mb ethernet. The newer 2610/11XM models support 100Mb, but will probably cost your more. If you can get it at a good price then go for it. The 2620/21 models support 100 also.
You'll need fastethernet (100Mb) to test VLAN trunking, though I never had one and still pass my CCNP. I would recommend you attack your certification in stages. Get your CCNA first. You have enough equipment for that. Once you're ready to study your CCNP, then go and acquire equipment for that path. No use planning too far ahead. Exams blueprints may change in 3 months and routers may be cheaper.
There are so many things you can include in your lab, but my motto is to cover the basics first and know them well. These include IP addressing (subnetting, etc..) IP routing (OSPF,RIP,EIGRP,BGP), router basics (logins, passwords, interfaces,troubleshooting),WAN technologies(Frame-relay,ISDN), and Access-lists. These are not only cores for the exam but essential core skills in the real world.
You should tackle VLANs/trunking when you're ready to sit your switching exam. Invest in the right equipment then. A cat 2924/48/50 will do the trick.
JimmyZ