Hi guys,
sorry to come up with a Lab question again but after receiving very valuable input last time I will try once more

Here is what I currently have in my lab:
2x 2970G
2x 2501
2x 2503
1x 2514
I am now about 70% trough my studies for SWITCH, I think. I have been working with switches over the past years so most concepts aren't new to me and I have configured things like VTP, HSRP etc in live networks. The 2970Gs sure aren't perfect for preparation but I think I might be fine with them for the switch exam.
I was looking at getting two 3550s (roughly $400 for a pair) or even a 3650 (cheapest seems to start at $350 in .de) but are they really necessary? Will they add any learning value to my lab?
Since I am not a real network guy (I deal with Linux 90% of my time) I don't see myself going for the CCIE any time soon. I would probably take the CCDP exams once it's recertification time or CCNP:Security but I don't think I would need the 35x0 for either.
What do you think? I appreciate your comments