I think starting with a 650b is a good thing..both my brothers ride titan mtb..one a 29er and one a 650b..absolutely no issues with either of the bikes. From what i have seen price wise, very good value for money.
I agree..the conti tyres run very nice. If you have trouble with them not sealing, remove them and clean them properly with thinners..then add 125ml ps2 Tyre Fluid. Locally manufactured product and it works fantastic.
I have just fitted some continental x kings protection.....hope you are planning on running tubes. They dont seal easy and they leak plenty on the side walls. Took me 2 weeks to get them to keep their pressure..